Polypeptides Having Cellulolytic Enhancing Activity and Polynucleotides Encoding Same

ABSTRACT

The present invention relates to polypeptides having cellulolytic enhancing activity, catalytic domains, and carbohydrate binding domains, and polynucleotides encoding the polypeptides, catalytic domains, and carbohydrate binding domains. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides, catalytic domains, and carbohydrate binding domains.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. application Ser.No. 14/648,876 filed Jun. 1, 2015, which is a 35 U.S.C. §371 nationalapplication of PCT/US2014/040148 filed May 30, 2014, which claimspriority or the benefit under 35 U.S.C. §119 of U.S. ProvisionalApplication Ser. No. 61/831,278 filed Jun. 5, 2013, the contents ofwhich are fully incorporated herein by reference.

REFERENCE TO A SEQUENCE LISTING

This application contains a Sequence Listing in computer readable form,which is incorporated herein by reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to polypeptides having cellulolyticenhancing activity, catalytic domains, and carbohydrate binding domains,and polynucleotides encoding the polypeptides, catalytic domains, andcarbohydrate binding domains. The invention also relates to nucleic acidconstructs, vectors, and host cells comprising the polynucleotides aswell as methods of producing and using the polypeptides, catalyticdomains, and carbohydrate binding domains.

Description of the Related Art

Cellulose is a polymer of the simple sugar glucose covalently linked bybeta-1,4-bonds. Many microorganisms produce enzymes that hydrolyzebeta-linked glucans. These enzymes include endoglucanases,cellobiohydrolases, and beta-glucosidases. Endoglucanases digest thecellulose polymer at random locations, opening it to attack bycellobiohydrolases. Cellobiohydrolases sequentially release molecules ofcellobiose from the ends of the cellulose polymer. Cellobiose is awater-soluble beta-1,4-linked dimer of glucose. Beta-glucosidaseshydrolyze cellobiose to glucose. Once the cellulose is converted toglucose, the glucose can easily be fermented by yeast into ethanol.

The conversion of lignocellulosic feedstocks into ethanol has theadvantages of the ready availability of large amounts of feedstock, thedesirability of avoiding burning or land filling the materials, and thecleanliness of the ethanol fuel. Wood, agricultural residues, herbaceouscrops, and municipal solid wastes have been considered as feedstocks forethanol production. These materials primarily consist of cellulose,hemicellulose, and lignin.

WO 2005/074647, WO 2008/148131, and WO 2011/035027 disclose GH61polypeptides having cellulolytic enhancing activity and thepolynucleotides thereof from Thielavia terrestris. WO 2005/074656 and WO2010/065830 disclose GH61 polypeptides having cellulolytic enhancingactivity and the polynucleotides thereof from Thermoascus aurantiacus.WO 2007/089290 and WO 2012/149344 disclose GH61 polypeptides havingcellulolytic enhancing activity and the polynucleotides thereof fromTrichoderma reesei. WO 2009/085935, WO 2009/085859, WO 2009/085864, andWO 2009/085868 disclose GH61 polypeptides having cellulolytic enhancingactivity and the polynucleotides thereof from Myceliophthorathermophila. WO 2010/138754 discloses a GH61 polypeptide havingcellulolytic enhancing activity and the polynucleotide thereof fromAspergillus fumigatus. WO 2011/005867 discloses a GH61 polypeptidehaving cellulolytic enhancing activity and the polynucleotide thereoffrom Penicillium pinophilum. WO 2011/039319 discloses a GH61 polypeptidehaving cellulolytic enhancing activity and the polynucleotide thereoffrom Thermoascus sp. WO 2011/041397 discloses a GH61 polypeptide havingcellulolytic enhancing activity and the polynucleotide thereof fromPenicillium sp. WO 2011/041504 discloses GH61 polypeptides havingcellulolytic enhancing activity and the polynucleotides thereof fromThermoascus crustaceus. WO 2012/030799 discloses GH61 polypeptideshaving cellulolytic enhancing activity and the polynucleotides thereoffrom Aspergillus aculeatus. WO 2012/113340 discloses GH61 polypeptideshaving cellulolytic enhancing activity and the polynucleotides thereoffrom Thermomyces lanuginosus. WO 2012/122477 discloses GH61 polypeptideshaving cellulolytic enhancing activity and the polynucleotides thereoffrom Aurantiporus alborubescens, Trichophaea saccata, and Penicilliumthomii. WO 2012/135659 discloses a GH61 polypeptide having cellulolyticenhancing activity and the polynucleotide thereof from Talaromycesstipitatus. WO 2012/146171 discloses GH61 polypeptides havingcellulolytic enhancing activity and the polynucleotides thereof fromHumicola insolens. WO 2012/101206 discloses GH61 polypeptides havingcellulolytic enhancing activity and the polynucleotides thereof fromMalbranchea cinnamomea, Talaromyces leycettanus, and Chaetomiumthermophilum. WO 2013/043910 discloses GH61 polypeptides havingcellulolytic enhancing activity and the polynucleotides thereof fromAcrophialophora fusispora and Corynascus sepedonium. WO 2008/151043 andWO 2012/122518 disclose methods of increasing the activity of a GH61polypeptide having cellulolytic enhancing activity by adding a divalentmetal cation to a composition comprising the polypeptide.

There is a need in the art for new enzymes to increase efficiency and toprovide cost-effective enzyme solutions for saccharification ofcellulosic material.

The present invention provides GH61 polypeptides having cellulolyticenhancing activity and polynucleotides encoding the polypeptides.

SUMMARY OF THE INVENTION

The present invention relates to isolated polypeptides havingcellulolytic enhancing activity selected from the group consisting of:

(a) a polypeptide having at least 70% sequence identity to the maturepolypeptide of SEQ ID NO: 2 or at least 80% sequence identity to themature polypeptide of SEQ ID NO: 4;

(b) a polypeptide encoded by a polynucleotide that hybridizes under atleast very high stringency conditions with the mature polypeptide codingsequence of SEQ ID NO: 1 or the cDNA sequence thereof, or the maturepolypeptide coding sequence of SEQ ID NO: 3; or the full-lengthcomplement thereof;

(c) a polypeptide encoded by a polynucleotide having at least 70%sequence identity to the mature polypeptide coding sequence of SEQ IDNO: 1 or the cDNA sequence thereof, or at least 80% sequence identity tothe mature polypeptide coding sequence of SEQ ID NO: 3;

(d) a variant of the mature polypeptide of SEQ ID NO: 2 or the maturepolypeptide of SEQ ID NO: 4 comprising a substitution, deletion, and/orinsertion at one or more (e.g., several) positions; and

(e) a fragment of the polypeptide of (a), (b), (c), or (d) that hascellulolytic enhancing activity.

The present invention also relates to isolated polypeptides comprising acatalytic domain selected from the group consisting of:

(a) a catalytic domain having at least 80% sequence identity to aminoacids 24 to 242 of SEQ ID NO: 4;

(b) a catalytic domain encoded by a polynucleotide that hybridizes underat least very high stringency conditions with nucleotides 70 to 726 ofSEQ ID NO: 3 or the full-length complement thereof;

(c) a catalytic domain encoded by a polynucleotide having at least 80%sequence identity to nucleotides 70 to 726 of SEQ ID NO: 3;

(d) a variant of amino acids 24 to 242 of SEQ ID NO: 4 comprising asubstitution, deletion, and/or insertion at one or more positions; and

(e) a fragment of the catalytic domain of (a), (b), (c), or (d) that hascellulolytic enhancing activity.

The present invention also relates to isolated polypeptides comprising acarbohydrate binding domain operably linked to a catalytic domain,wherein the binding domain is selected from the group consisting of:

(a) a carbohydrate binding domain having at least 80% sequence identityto amino acids 326 to 366 of SEQ ID NO: 4;

(b) a carbohydrate binding domain encoded by a polynucleotide thathybridizes under at least very high stringency conditions withnucleotides 976 to 1098 of SEQ ID NO: 3 or the full-length complementthereof;

(c) a carbohydrate binding domain encoded by a polynucleotide having atleast 80% sequence identity to nucleotides 976 to 1098 of SEQ ID NO: 3;

(d) a variant of amino acids 326 to 366 of SEQ ID NO: 4 comprising asubstitution, deletion, and/or insertion at one or more positions; and

(e) a fragment of the carbohydrate binding domain of (a), (b), (c), or(d) that has binding activity.

The present invention also relates to isolated polynucleotides encodingthe polypeptides of the present invention; nucleic acid constructs,recombinant expression vectors, and recombinant host cells comprisingthe polynucleotides; and methods of producing the polypeptides.

The present invention also relates to processes for degrading acellulosic material, comprising: treating the cellulosic material withan enzyme composition in the presence of a polypeptide havingcellulolytic enhancing activity of the present invention.

The present invention also relates to processes of producing afermentation product, comprising: (a) saccharifying a cellulosicmaterial with an enzyme composition in the presence of a polypeptidehaving cellulolytic enhancing activity of the present invention; (b)fermenting the saccharified cellulosic material with one or more (e.g.,several) fermenting microorganisms to produce the fermentation product;and (c) recovering the fermentation product from the fermentation.

The present invention also relates to processes of fermenting acellulosic material, comprising: fermenting the cellulosic material withone or more (e.g., several) fermenting microorganisms, wherein thecellulosic material is saccharified with an enzyme composition in thepresence of a polypeptide having cellulolytic enhancing activity of thepresent invention.

The present invention also relates to an isolated polynucleotideencoding a signal peptide comprising or consisting of amino acids 1 to21 of SEQ ID NO: 2 or amino acids 1 to 23 of SEQ ID NO: 4, which isoperably linked to a gene encoding a protein, wherein the protein isforeign to the signal peptide; nucleic acid constructs, expressionvectors, and recombinant host cells comprising the polynucleotides; andmethods of producing a protein.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the effect of the Talaromyces leycettanus P23XBM GH61polypeptide on the hydrolysis of microcrystalline cellulose for 72 hoursin 50 mM ammonium acetate pH 5.0.

FIG. 2 shows the effect of the Talaromyces leycettanus P23XBM GH61polypeptide on the hydrolysis of microcrystalline cellulose for 72 hoursin 50 mM ammonium acetate pH 8.0.

FIG. 3 shows the effect of the Talaromyces leycettanus P23XBP GH61polypeptide on the hydrolysis of microcrystalline cellulose for 72 hoursin 50 mM ammonium acetate pH 5.0.

FIG. 4 shows the effect of the Talaromyces leycettanus P23XBP GH61polypeptide on the hydrolysis of microcrystalline cellulose for 72 hoursin 50 mM ammonium acetate pH 8.0.

FIG. 5 shows the effect of the Talaromyces leycettanus P23XBM GH61polypeptide and the Talaromyces leycettanus P23XBP GH61 polypeptide onthe hydrolysis of pretreated corn stover (PCS) by a cellulolytic enzymecomposition.

DEFINITIONS

Acetylxylan esterase: The term “acetylxylan esterase” means acarboxylesterase (EC 3.1.1.72) that catalyzes the hydrolysis of acetylgroups from polymeric xylan, acetylated xylose, acetylated glucose,alpha-napthyl acetate, and p-nitrophenyl acetate. For purposes of thepresent invention, acetylxylan esterase activity is determined using 0.5mM p-nitrophenylacetate as substrate in 50 mM sodium acetate pH 5.0containing 0.01% TWEEN™ 20 (polyoxyethylene sorbitan monolaurate). Oneunit of acetylxylan esterase is defined as the amount of enzyme capableof releasing 1 μmole of p-nitrophenolate anion per minute at pH 5, 25°C.

Allelic variant: The term “allelic variant” means any of two or morealternative forms of a gene occupying the same chromosomal locus.Allelic variation arises naturally through mutation, and may result inpolymorphism within populations. Gene mutations can be silent (no changein the encoded polypeptide) or may encode polypeptides having alteredamino acid sequences. An allelic variant of a polypeptide is apolypeptide encoded by an allelic variant of a gene.

Alpha-L-arabinofuranosidase: The term “alpha-L-arabinofuranosidase”means an alpha-L-arabinofuranoside arabinofuranohydrolase (EC 3.2.1.55)that catalyzes the hydrolysis of terminal non-reducingalpha-L-arabinofuranoside residues in alpha-L-arabinosides. The enzymeacts on alpha-L-arabinofuranosides, alpha-L-arabinans containing (1,3)-and/or (1,5)-linkages, arabinoxylans, and arabinogalactans.Alpha-L-arabinofuranosidase is also known as arabinosidase,alpha-arabinosidase, alpha-L-arabinosidase, alpha-arabinofuranosidase,polysaccharide alpha-L-arabinofuranosidase, alpha-L-arabinofuranosidehydrolase, L-arabinosidase, or alpha-L-arabinanase. For purposes of thepresent invention, alpha-L-arabinofuranosidase activity is determinedusing 5 mg of medium viscosity wheat arabinoxylan (MegazymeInternational Ireland, Ltd., Bray, Co. Wicklow, Ireland) per ml of 100mM sodium acetate pH 5 in a total volume of 200 μl for 30 minutes at 40°C. followed by arabinose analysis by AMINEX® HPX-87H columnchromatography (Bio-Rad Laboratories, Inc., Hercules, Calif., USA).

Alpha-glucuronidase: The term “alpha-glucuronidase” means analpha-D-glucosiduronate glucuronohydrolase (EC 3.2.1.139) that catalyzesthe hydrolysis of an alpha-D-glucuronoside to D-glucuronate and analcohol. For purposes of the present invention, alpha-glucuronidaseactivity is determined according to de Vries, 1998, J. Bacteriol. 180:243-249. One unit of alpha-glucuronidase equals the amount of enzymecapable of releasing 1 μmole of glucuronic or 4-O-methylglucuronic acidper minute at pH 5, 40° C.

Beta-glucosidase: The term “beta-glucosidase” means a beta-D-glucosideglucohydrolase (E.C. 3.2.1.21) that catalyzes the hydrolysis of terminalnon-reducing beta-D-glucose residues with the release of beta-D-glucose.For purposes of the present invention, beta-glucosidase activity isdetermined using p-nitrophenyl-beta-D-glucopyranoside as substrateaccording to the procedure of Venturi et al., 2002, J. Basic Microbiol.42: 55-66. One unit of beta-glucosidase is defined as 1.0 μmole ofp-nitrophenolate anion produced per minute at 37° C., pH 5.0 from 1 mMp-nitrophenyl-beta-D-glucopyranoside as substrate in 100 mM succinicacid, 100 mM HEPES, 100 mM CHES, 100 mM CABS, 1 mM CaCl₂, 150 mM KCl,0.01% TRITON® X-100 (4-(1,1,3,3-tetramethylbutyl)phenyl-polyethyleneglycol).

Beta-xylosidase: The term “beta-xylosidase” means a beta-D-xylosidexylohydrolase (E.C. 3.2.1.37) that catalyzes the exo-hydrolysis of shortbeta (1→4)-xylooligosaccharides to remove successive D-xylose residuesfrom non-reducing termini. For purposes of the present invention,beta-xylosidase activity is determined using 1 mMp-nitrophenyl-beta-D-xyloside as substrate in 100 mM sodium citratecontaining 0.01% TWEEN® 20 at pH 5, 40° C. One unit of beta-xylosidaseis defined as 1.0 μmole of p-nitrophenolate anion produced per minute at40° C., pH 5 from 1 mM p-nitrophenyl-beta-D-xyloside in 100 mM sodiumcitrate containing 0.01% TWEEN® 20.

Carbohydrate binding domain: The term “carbohydrate binding domain”means the region of an enzyme that mediates binding of the enzyme toamorphous regions of a cellulose substrate. The carbohydrate bindingdomain (CBD) is typically found either at the N-terminal or at theC-terminal extremity of an enzyme. The term “carbohydrate bindingdomain” is also referred herein as “cellulose binding domain”.

Catalytic domain: The term “catalytic domain” means the region of anenzyme containing the catalytic machinery of the enzyme.

cDNA: The term “cDNA” means a DNA molecule that can be prepared byreverse transcription from a mature, spliced, mRNA molecule obtainedfrom a eukaryotic or prokaryotic cell. cDNA lacks intron sequences thatmay be present in the corresponding genomic DNA. The initial, primaryRNA transcript is a precursor to mRNA that is processed through a seriesof steps, including splicing, before appearing as mature spliced mRNA.

Cellobiohydrolase: The term “cellobiohydrolase” means a1,4-beta-D-glucan cellobiohydrolase (E.C. 3.2.1.91 and E.C. 3.2.1.176)that catalyzes the hydrolysis of 1,4-beta-D-glucosidic linkages incellulose, cellooligosaccharides, or any beta-1,4-linked glucosecontaining polymer, releasing cellobiose from the reducing end(cellobiohydrolase I) or non-reducing end (cellobiohydrolase II) of thechain (Teeri, 1997, Trends in Biotechnology 15: 160-167; Teeri et al.,1998, Biochem. Soc. Trans. 26: 173-178). Cellobiohydrolase activity isdetermined according to the procedures described by Lever et al., 1972,Anal. Biochem. 47: 273-279; van Tilbeurgh et al., 1982, FEBS Letters,149: 152-156; van Tilbeurgh and Claeyssens, 1985, FEBS Letters, 187:283-288; and Tomme et al., 1988, Eur. J. Biochem. 170: 575-581. In thepresent invention, the Tomme et al. method can be used to determinecellobiohydrolase activity.

Cellulolytic enzyme or cellulase: The term “cellulolytic enzyme” or“cellulase” means one or more (e.g., several) enzymes that hydrolyze acellulosic material. Such enzymes include endoglucanase(s),cellobiohydrolase(s), beta-glucosidase(s), or combinations thereof. Thetwo basic approaches for measuring cellulolytic enzyme activity include:(1) measuring the total cellulolytic enzyme activity, and (2) measuringthe individual cellulolytic enzyme activities (endoglucanases,cellobiohydrolases, and beta-glucosidases) as reviewed in Zhang et al.,2006, Biotechnology Advances 24: 452-481. Total cellulolytic enzymeactivity can be measured using insoluble substrates, including WhatmanNo 1 filter paper, microcrystalline cellulose, bacterial cellulose,algal cellulose, cotton, pretreated lignocellulose, etc. The most commontotal cellulolytic activity assay is the filter paper assay usingWhatman No 1 filter paper as the substrate. The assay was established bythe International Union of Pure and Applied Chemistry (IUPAC) (Ghose,1987, Pure Appl. Chem. 59: 257-68).

For purposes of the present invention, cellulolytic enzyme activity isdetermined by measuring the increase in production/release of sugarsduring hydrolysis of a cellulosic material by cellulolytic enzyme(s)under the following conditions: 1-50 mg of cellulolytic enzyme protein/gof cellulose in pretreated corn stover (PCS) (or other pretreatedcellulosic material) for 3-7 days at a suitable temperature such as 40°C.-80° C., e.g., 50° C., 55° C., 60° C., 65° C., or 70° C., and asuitable pH such as 4-9, e.g., 5.0, 5.5, 6.0, 6.5, or 7.0, compared to acontrol hydrolysis without addition of cellulolytic enzyme protein.Typical conditions are 1 ml reactions, washed or unwashed PCS, 5%insoluble solids (dry weight), 50 mM sodium acetate pH 5, 1 mM MnSO₄,50° C., 55° C., or 60° C., 72 hours, sugar analysis by AMINEX® HPX-87Hcolumn chromatography (Bio-Rad Laboratories, Inc., Hercules, Calif.,USA).

Cellulosic material: The term “cellulosic material” means any materialcontaining cellulose. The predominant polysaccharide in the primary cellwall of biomass is cellulose, the second most abundant is hemicellulose,and the third is pectin. The secondary cell wall, produced after thecell has stopped growing, also contains polysaccharides and isstrengthened by polymeric lignin covalently cross-linked tohemicellulose. Cellulose is a homopolymer of anhydrocellobiose and thusa linear beta-(1-4)-D-glucan, while hemicelluloses include a variety ofcompounds, such as xylans, xyloglucans, arabinoxylans, and mannans incomplex branched structures with a spectrum of substituents. Althoughgenerally polymorphous, cellulose is found in plant tissue primarily asan insoluble crystalline matrix of parallel glucan chains.Hemicelluloses usually hydrogen bond to cellulose, as well as to otherhemicelluloses, which help stabilize the cell wall matrix.

Cellulose is generally found, for example, in the stems, leaves, hulls,husks, and cobs of plants or leaves, branches, and wood of trees. Thecellulosic material can be, but is not limited to, agricultural residue,herbaceous material (including energy crops), municipal solid waste,pulp and paper mill residue, waste paper, and wood (including forestryresidue) (see, for example, Wiselogel et al., 1995, in Handbook onBioethanol (Charles E. Wyman, editor), pp. 105-118, Taylor & Francis,Washington D.C.; Wyman, 1994, Bioresource Technology 50: 3-16; Lynd,1990, Applied Biochemistry and Biotechnology 24/25: 695-719; Mosier etal., 1999, Recent Progress in Bioconversion of Lignocellulosics, inAdvances in Biochemical Engineering/Biotechnology, T. Scheper, managingeditor, Volume 65, pp. 23-40, Springer-Verlag, New York). It isunderstood herein that the cellulose may be in the form oflignocellulose, a plant cell wall material containing lignin, cellulose,and hemicellulose in a mixed matrix. In one aspect, the cellulosicmaterial is any biomass material. In another aspect, the cellulosicmaterial is lignocellulose, which comprises cellulose, hemicelluloses,and lignin.

In an embodiment, the cellulosic material is agricultural residue,herbaceous material (including energy crops), municipal solid waste,pulp and paper mill residue, waste paper, or wood (including forestryresidue).

In another embodiment, the cellulosic material is arundo, bagasse,bamboo, corn cob, corn fiber, corn stover, miscanthus, rice straw,switchgrass, or wheat straw.

In another embodiment, the cellulosic material is aspen, eucalyptus,fir, pine, poplar, spruce, or willow.

In another embodiment, the cellulosic material is algal cellulose,bacterial cellulose, cotton linter, filter paper, microcrystallinecellulose (e.g., AVICEL®), or phosphoric-acid treated cellulose.

In another embodiment, the cellulosic material is an aquatic biomass. Asused herein the term “aquatic biomass” means biomass produced in anaquatic environment by a photosynthesis process. The aquatic biomass canbe algae, emergent plants, floating-leaf plants, or submerged plants.

The cellulosic material may be used as is or may be subjected topretreatment, using conventional methods known in the art, as describedherein. In a preferred aspect, the cellulosic material is pretreated.

Coding sequence: The term “coding sequence” means a polynucleotide,which directly specifies the amino acid sequence of a polypeptide. Theboundaries of the coding sequence are generally determined by an openreading frame, which begins with a start codon such as ATG, GTG, or TTGand ends with a stop codon such as TAA, TAG, or TGA. The coding sequencemay be a genomic DNA, cDNA, synthetic DNA, or a combination thereof.

Control sequences: The term “control sequences” means nucleic acidsequences necessary for expression of a polynucleotide encoding a maturepolypeptide of the present invention. Each control sequence may benative (i.e., from the same gene) or foreign (i.e., from a differentgene) to the polynucleotide encoding the polypeptide or native orforeign to each other. Such control sequences include, but are notlimited to, a leader, polyadenylation sequence, propeptide sequence,promoter, signal peptide sequence, and transcription terminator. At aminimum, the control sequences include a promoter, and transcriptionaland translational stop signals. The control sequences may be providedwith linkers for the purpose of introducing specific restriction sitesfacilitating ligation of the control sequences with the coding region ofthe polynucleotide encoding a polypeptide.

Endoglucanase: The term “endoglucanase” means a4-(1,3;1,4)-beta-D-glucan 4-glucanohydrolase (E.C. 3.2.1.4) thatcatalyzes endohydrolysis of 1,4-beta-D-glycosidic linkages in cellulose,cellulose derivatives (such as carboxymethyl cellulose and hydroxyethylcellulose), lichenin, beta-1,4 bonds in mixed beta-1,3-1,4 glucans suchas cereal beta-D-glucans or xyloglucans, and other plant materialcontaining cellulosic components. Endoglucanase activity can bedetermined by measuring reduction in substrate viscosity or increase inreducing ends determined by a reducing sugar assay (Zhang et al., 2006,Biotechnology Advances 24: 452-481). For purposes of the presentinvention, endoglucanase activity is determined using carboxymethylcellulose (CMC) as substrate according to the procedure of Ghose, 1987,Pure and Appl. Chem. 59: 257-268, at pH 5, 40° C.

Expression: The term “expression” includes any step involved in theproduction of a polypeptide including, but not limited to,transcription, post-transcriptional modification, translation,post-translational modification, and secretion.

Expression vector: The term “expression vector” means a linear orcircular DNA molecule that comprises a polynucleotide encoding apolypeptide and is operably linked to control sequences that provide forits expression.

Family 61 glycoside hydrolase: The term “Family 61 glycoside hydrolase”or “Family GH61” or “GH61” means a polypeptide falling into theglycoside hydrolase Family 61 according to Henrissat B., 1991, Biochem.J. 280: 309-316, and Henrissat B., and Bairoch A., 1996, Biochem. J.316: 695-696. The enzymes in this family were originally classified as aglycoside hydrolase family based on measurement of very weakendo-1,4-beta-D-glucanase activity in one family member. GH61polypeptides are now classified as a lytic polysaccharide monooxygenase(Quinlan et al., 2011, Proc. Natl. Acad. Sci. USA 208: 15079-15084;Phillips et al., 2011, ACS Chem. Biol. 6: 1399-1406; Lin et al., 2012,Structure 20: 1051-1061) and placed into a new family designated“Auxiliary Activity 9” or “AA9”.

Feruloyl esterase: The term “feruloyl esterase” means a4-hydroxy-3-methoxycinnamoyl-sugar hydrolase (EC 3.1.1.73) thatcatalyzes the hydrolysis of 4-hydroxy-3-methoxycinnamoyl (feruloyl)groups from esterified sugar, which is usually arabinose in naturalbiomass substrates, to produce ferulate (4-hydroxy-3-methoxycinnamate).Feruloyl esterase (FAE) is also known as ferulic acid esterase,hydroxycinnamoyl esterase, FAE-III, cinnamoyl ester hydrolase, FAEA,cinnAE, FAE-I, or FAE-II. For purposes of the present invention,feruloyl esterase activity is determined using 0.5 mMp-nitrophenylferulate as substrate in 50 mM sodium acetate pH 5.0. Oneunit of feruloyl esterase equals the amount of enzyme capable ofreleasing 1 μmole of p-nitrophenolate anion per minute at pH 5, 25° C.

Fragment: The term “fragment” means a polypeptide having one or more(e.g., several) amino acids absent from the amino and/or carboxylterminus of a mature polypeptide; wherein the fragment has cellulolyticenhancing activity. In one aspect, a fragment contains at least 200amino acid residues, e.g., at least 210 amino acid residues or at least220 amino acid residues of SEQ ID NO: 2. In another aspect, a fragmentcontains at least 300 amino acid residues, e.g., at least 315 amino acidresidues or at least 330 amino acid residues of SEQ ID NO: 4.

Hemicellulolytic enzyme or hemicellulase: The term “hemicellulolyticenzyme” or “hemicellulase” means one or more (e.g., several) enzymesthat hydrolyze a hemicellulosic material. See, for example, Shallom andShoham, 2003, Current Opinion In Microbiology 6(3): 219-228).Hemicellulases are key components in the degradation of plant biomass.Examples of hemicellulases include, but are not limited to, anacetylmannan esterase, an acetylxylan esterase, an arabinanase, anarabinofuranosidase, a coumaric acid esterase, a feruloyl esterase, agalactosidase, a glucuronidase, a glucuronoyl esterase, a mannanase, amannosidase, a xylanase, and a xylosidase. The substrates for theseenzymes, hemicelluloses, are a heterogeneous group of branched andlinear polysaccharides that are bound via hydrogen bonds to thecellulose microfibrils in the plant cell wall, crosslinking them into arobust network. Hemicelluloses are also covalently attached to lignin,forming together with cellulose a highly complex structure. The variablestructure and organization of hemicelluloses require the concertedaction of many enzymes for its complete degradation. The catalyticmodules of hemicellulases are either glycoside hydrolases (GHs) thathydrolyze glycosidic bonds, or carbohydrate esterases (CEs), whichhydrolyze ester linkages of acetate or ferulic acid side groups. Thesecatalytic modules, based on homology of their primary sequence, can beassigned into GH and CE families. Some families, with an overall similarfold, can be further grouped into clans, marked alphabetically (e.g.,GH-A). A most informative and updated classification of these and othercarbohydrate active enzymes is available in the Carbohydrate-ActiveEnzymes (CAZy) database. Hemicellulolytic enzyme activities can bemeasured according to Ghose and Bisaria, 1987, Pure & Appl. Chem. 59:1739-1752, at a suitable temperature such as 40° C.-80° C., e.g., 50°C., 55° C., 60° C., 65° C., or 70° C., and a suitable pH such as 4-9,e.g., 5.0, 5.5, 6.0, 6.5, or 7.0.

High stringency conditions: The term “high stringency conditions” meansfor probes of at least 100 nucleotides in length, prehybridization andhybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml shearedand denatured salmon sperm DNA, and 50% formamide, following standardSouthern blotting procedures for 12 to 24 hours. The carrier material isfinally washed three times each for 15 minutes using 0.2×SSC, 0.2% SDSat 65° C.

Host cell: The term “host cell” means any cell type that is susceptibleto transformation, transfection, transduction, or the like with anucleic acid construct or expression vector comprising a polynucleotideof the present invention. The term “host cell” encompasses any progenyof a parent cell that is not identical to the parent cell due tomutations that occur during replication.

Isolated: The term “isolated” means a substance in a form or environmentthat does not occur in nature. Non-limiting examples of isolatedsubstances include (1) any non-naturally occurring substance, (2) anysubstance including, but not limited to, any enzyme, variant, nucleicacid, protein, peptide or cofactor, that is at least partially removedfrom one or more or all of the naturally occurring constituents withwhich it is associated in nature; (3) any substance modified by the handof man relative to that substance found in nature; or (4) any substancemodified by increasing the amount of the substance relative to othercomponents with which it is naturally associated (e.g., recombinantproduction in a host cell; multiple copies of a gene encoding thesubstance; and use of a stronger promoter than the promoter naturallyassociated with the gene encoding the substance).

Low stringency conditions: The term “low stringency conditions” meansfor probes of at least 100 nucleotides in length, prehybridization andhybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml shearedand denatured salmon sperm DNA, and 25% formamide, following standardSouthern blotting procedures for 12 to 24 hours. The carrier material isfinally washed three times each for 15 minutes using 0.2×SSC, 0.2% SDSat 50° C.

Mature polypeptide: The term “mature polypeptide” means a polypeptide inits final form following translation and any post-translationalmodifications, such as N-terminal processing, C-terminal truncation,glycosylation, phosphorylation, etc. In one aspect, the maturepolypeptide is amino acids 22 to 251 of SEQ ID NO: 2 (P23XBM) based onthe SignalP 3.0 program (Bendtsen et al., 2004, J. Mol. Biol. 340:783-795) that predicts amino acids 1 to 21 of SEQ ID NO: 2 are a signalpeptide. In another aspect, the mature polypeptide is amino acids 24 to366 of SEQ ID NO: 4 (P23XBP) based on the SignalP 3.0 program thatpredicts amino acids 1 to 23 of SEQ ID NO: 4 are a signal peptide. It isknown in the art that a host cell may produce a mixture of two of moredifferent mature polypeptides (i.e., with a different C-terminal and/orN-terminal amino acid) expressed by the same polynucleotide.

Mature polypeptide coding sequence: The term “mature polypeptide codingsequence” means a polynucleotide that encodes a mature polypeptidehaving cellulolytic enhancing activity. In one aspect, the maturepolypeptide coding sequence is nucleotides 64 to 817 of SEQ ID NO: 1(D72NHC) or the cDNA sequence thereof based on the SignalP 3.0 program(Bendtsen et al., 2004, supra) that predicts nucleotides 1 to 63 of SEQID NO: 1 encode a signal peptide. In another aspect, the maturepolypeptide coding sequence is nucleotides 70 to 1098 of SEQ ID NO: 3(D72NHD) based on the SignalP 3.0 program that predicts nucleotides 1 to69 of SEQ ID NO: 3 encode a signal peptide.

Medium stringency conditions: The term “medium stringency conditions”means for probes of at least 100 nucleotides in length, prehybridizationand hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/mlsheared and denatured salmon sperm DNA, and 35% formamide, followingstandard Southern blotting procedures for 12 to 24 hours. The carriermaterial is finally washed three times each for 15 minutes using0.2×SSC, 0.2% SDS at 55° C.

Medium-high stringency conditions: The term “medium-high stringencyconditions” means for probes of at least 100 nucleotides in length,prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 35% formamide,following standard Southern blotting procedures for 12 to 24 hours. Thecarrier material is finally washed three times each for 15 minutes using0.2×SSC, 0.2% SDS at 60° C.

Nucleic acid construct: The term “nucleic acid construct” means anucleic acid molecule, either single- or double-stranded, which isisolated from a naturally occurring gene or is modified to containsegments of nucleic acids in a manner that would not otherwise exist innature or which is synthetic, which comprises one or more controlsequences.

Operably linked: The term “operably linked” means a configuration inwhich a control sequence is placed at an appropriate position relativeto the coding sequence of a polynucleotide such that the controlsequence directs expression of the coding sequence.

Polypeptide having cellulolytic enhancing activity: The term“polypeptide having cellulolytic enhancing activity” means a GH61polypeptide that catalyzes the enhancement of the hydrolysis of acellulosic material by enzyme having cellulolytic activity. For purposesof the present invention, cellulolytic enhancing activity is determinedby measuring the increase in reducing sugars or the increase of thetotal of cellobiose and glucose from the hydrolysis of a cellulosicmaterial by cellulolytic enzyme under the following conditions: 1-50 mgof total protein/g of cellulose in pretreated corn stover (PCS), whereintotal protein is comprised of 50-99.5% w/w cellulolytic enzyme proteinand 0.5-50% w/w protein of a GH61 polypeptide having cellulolyticenhancing activity for 1-7 days at a suitable temperature, such as 40°C.-80° C., e.g., 50° C., 55° C., 60° C., 65° C., or 70° C., and asuitable pH, such as 4-9, e.g., 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0,or 8.5, compared to a control hydrolysis with equal total proteinloading without cellulolytic enhancing activity (1-50 mg of cellulolyticprotein/g of cellulose in PCS).

GH61 polypeptide enhancing activity can be determined using a mixture ofCELLUCLAST® 1.5L (Novozymes A/S, Bagsværd, Denmark) and beta-glucosidaseas the source of the cellulolytic activity, wherein the beta-glucosidaseis present at a weight of at least 2-5% protein of the cellulase proteinloading. In one aspect, the beta-glucosidase is an Aspergillus oryzaebeta-glucosidase (e.g., recombinantly produced in Aspergillus oryzaeaccording to WO 02/095014). In another aspect, the beta-glucosidase isan Aspergillus fumigatus beta-glucosidase (e.g., recombinantly producedin Aspergillus oryzae as described in WO 02/095014).

GH61 polypeptide enhancing activity can also be determined by incubatingthe GH61 polypeptide with 0.5% phosphoric acid swollen cellulose (PASC),100 mM sodium acetate pH 5, 1 mM MnSO₄, 0.1% gallic acid, 0.025 mg/ml ofAspergillus fumigatus beta-glucosidase, and 0.01% TRITON® X-100 for24-96 hours at 40° C. followed by determination of the glucose releasedfrom the PASC

GH61 polypeptide enhancing activity can also be determined according toWO 2013/028928 for high temperature compositions.

Alternatively, cellulolytic enhancing activity is determined accordingto Example 10 or Example 13 described herein.

The GH61 polypeptides having cellulolytic enhancing activity enhance thehydrolysis of a cellulosic material catalyzed by enzyme havingcellulolytic activity by reducing the amount of cellulolytic enzymerequired to reach the same degree of hydrolysis preferably at least1.01-fold, e.g., at least 1.05-fold, at least 1.10-fold, at least1.25-fold, at least 1.5-fold, at least 2-fold, at least 3-fold, at least4-fold, at least 5-fold, at least 10-fold, or at least 20-fold.

The GH61 polypeptides of the present invention have at least 20%, e.g.,at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, atleast 90%, at least 95%, and at least 100% of the cellulolytic enhancingactivity of the mature polypeptide of SEQ ID NO: 2 or the maturepolypeptide of SEQ ID NO: 4, or homologs thereof.

Pretreated corn stover: The term “Pretreated Corn Stover” or “PCS” meansa cellulosic material derived from corn stover by treatment with heatand dilute sulfuric acid, alkaline pretreatment, neutral pretreatment,or any pretreatment known in the art.

Sequence identity: The relatedness between two amino acid sequences orbetween two nucleotide sequences is described by the parameter “sequenceidentity”.

For purposes of the present invention, the sequence identity between twoamino acid sequences is determined using the Needleman-Wunsch algorithm(Needleman and Wunsch, 1970, J. Mol. Biol. 48: 443-453) as implementedin the Needle program of the EMBOSS package (EMBOSS: The EuropeanMolecular Biology Open Software Suite, Rice et al., 2000, Trends Genet.16: 276-277), preferably version 3.0.0, 5.0.0 or later. The parametersused are a gap open penalty of 10, a gap extension penalty of 0.5, andthe EBLOSUM62 (EMBOSS version of BLOSUM62) substitution matrix. Theoutput of Needle labeled “longest identity” (obtained using the −nobriefoption) is used as the percent identity and is calculated as follows:

(Identical Residues×100)/(Length of Alignment−Total Number of Gaps inAlignment)

For purposes of the present invention, the sequence identity between twodeoxyribonucleotide sequences is determined using the Needleman-Wunschalgorithm (Needleman and Wunsch, 1970, supra) as implemented in theNeedle program of the EMBOSS package (EMBOSS: The European MolecularBiology Open Software Suite, Rice et al., 2000, supra), preferablyversion 3.0.0, 5.0.0 or later. The parameters used are a gap openpenalty of 10, a gap extension penalty of 0.5, and the EDNAFULL (EMBOSSversion of NCBI NUC4.4) substitution matrix. The output of Needlelabeled “longest identity” (obtained using the −nobrief option) is usedas the percent identity and is calculated as follows:

(Identical Deoxyribonucleotides×100)/(Length of Alignment−Total Numberof Gaps in Alignment)

Subsequence: The term “subsequence” means a polynucleotide having one ormore (e.g., several) nucleotides absent from the 5′ and/or 3′ end of amature polypeptide coding sequence; wherein the subsequence encodes afragment having cellulolytic enhancing activity. In one aspect, asubsequence contains at least 600 nucleotides, e.g., at least 630nucleotides or at least 660 nucleotides of SEQ ID NO: 1. In anotheraspect, a subsequence contains at least 900 nucleotides, e.g., at least945 nucleotides or at least 990 nucleotides of SEQ ID NO: 3.

Variant: The term “variant” means a polypeptide having cellulolyticenhancing activity comprising an alteration, i.e., a substitution,insertion, and/or deletion, at one or more (e.g., several) positions. Asubstitution means replacement of the amino acid occupying a positionwith a different amino acid; a deletion means removal of the amino acidoccupying a position; and an insertion means adding an amino acidadjacent to and immediately following the amino acid occupying aposition.

Very high stringency conditions: The term “very high stringencyconditions” means for probes of at least 100 nucleotides in length,prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide,following standard Southern blotting procedures for 12 to 24 hours. Thecarrier material is finally washed three times each for 15 minutes using0.2×SSC, 0.2% SDS at 70° C.

Very low stringency conditions: The term “very low stringencyconditions” means for probes of at least 100 nucleotides in length,prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 25% formamide,following standard Southern blotting procedures for 12 to 24 hours. Thecarrier material is finally washed three times each for 15 minutes using0.2×SSC, 0.2% SDS at 45° C.

Xylan-containing material: The term “xylan-containing material” meansany material comprising a plant cell wall polysaccharide containing abackbone of beta-(1-4)-linked xylose residues. Xylans of terrestrialplants are heteropolymers possessing a beta-(1-4)-D-xylopyranosebackbone, which is branched by short carbohydrate chains. They compriseD-glucuronic acid or its 4-O-methyl ether, L-arabinose, and/or variousoligosaccharides, composed of D-xylose, L-arabinose, D- or L-galactose,and D-glucose. Xylan-type polysaccharides can be divided into homoxylansand heteroxylans, which include glucuronoxylans,(arabino)glucuronoxylans, (glucurono)arabinoxylans, arabinoxylans, andcomplex heteroxylans. See, for example, Ebringerova et al., 2005, Adv.Polym. Sci. 186: 1-67.

In the processes of the present invention, any material containing xylanmay be used. In a preferred aspect, the xylan-containing material islignocellulose.

Xylan degrading activity or xylanolytic activity: The term “xylandegrading activity” or “xylanolytic activity” means a biologicalactivity that hydrolyzes xylan-containing material. The two basicapproaches for measuring xylanolytic activity include: (1) measuring thetotal xylanolytic activity, and (2) measuring the individual xylanolyticactivities (e.g., endoxylanases, beta-xylosidases, arabinofuranosidases,alpha-glucuronidases, acetylxylan esterases, feruloyl esterases, andalpha-glucuronyl esterases). Recent progress in assays of xylanolyticenzymes was summarized in several publications including Biely andPuchard, 2006, Journal of the Science of Food and Agriculture 86(11):1636-1647; Spanikova and Biely, 2006, FEBS Letters 580(19): 4597-4601;Herrimann et al., 1997, Biochemical Journal 321: 375-381.

Total xylan degrading activity can be measured by determining thereducing sugars formed from various types of xylan, including, forexample, oat spelt, beechwood, and larchwood xylans, or by photometricdetermination of dyed xylan fragments released from various covalentlydyed xylans. A common total xylanolytic activity assay is based onproduction of reducing sugars from polymeric 4-O-methyl glucuronoxylanas described in Bailey et al., 1992, Interlaboratory testing of methodsfor assay of xylanase activity, Journal of Biotechnology 23(3): 257-270.Xylanase activity can also be determined with 0.2% AZCL-arabinoxylan assubstrate in 0.01% TRITON® X-100 and 200 mM sodium phosphate pH 6 at 37°C. One unit of xylanase activity is defined as 1.0 μmole of azurineproduced per minute at 37° C., pH 6 from 0.2% AZCL-arabinoxylan assubstrate in 200 mM sodium phosphate pH 6.

For purposes of the present invention, xylan degrading activity isdetermined by measuring the increase in hydrolysis of birchwood xylan(Sigma Chemical Co., Inc., St. Louis, Mo., USA) by xylan-degradingenzyme(s) under the following typical conditions: 1 ml reactions, 5mg/ml substrate (total solids), 5 mg of xylanolytic protein/g ofsubstrate, 50 mM sodium acetate pH 5, 50° C., 24 hours, sugar analysisusing p-hydroxybenzoic acid hydrazide (PHBAH) assay as described byLever, 1972, Anal. Biochem 47: 273-279.

Xylanase: The term “xylanase” means a 1,4-beta-D-xylan-xylohydrolase(E.C. 3.2.1.8) that catalyzes the endohydrolysis of 1,4-beta-D-xylosidiclinkages in xylans. For purposes of the present invention, xylanaseactivity is determined with 0.2% AZCL-arabinoxylan as substrate in 0.01%TRITON® X-100 and 200 mM sodium phosphate pH 6 at 37° C. One unit ofxylanase activity is defined as 1.0 μmole of azurine produced per minuteat 37° C., pH 6 from 0.2% AZCL-arabinoxylan as substrate in 200 mMsodium phosphate pH 6.

DETAILED DESCRIPTION OF THE INVENTION Polypeptides Having CellulolyticEnhancing Activity

In an embodiment, the present invention relates to isolated polypeptideshaving a sequence identity to the mature polypeptide of SEQ ID NO: 2 ofat least 70%, e.g., at least 75%, at least 80%, at least 81%, at least82%, at least 83%, at least 84%, at least 85%, at least 86%, at least87%, at least 88%, at least 89%, at least 90%, at least 91%, at least92%, at least 93%, at least 94%, at least 95%, at least 96%, at least97%, at least 98%, at least 99%, or 100%, or the mature polypeptide ofSEQ ID NO: 4 of at least 80%, e.g., at least 81%, at least 82%, at least83%, at least 84%, at least 85%, at least 86%, at least 87%, at least88%, at least 89%, at least 90%, at least 91%, at least 92%, at least93%, at least 94%, at least 95%, at least 96%, at least 97%, at least98%, at least 99%, or 100%, which have cellulolytic enhancing activity.In one aspect, the polypeptides differ by up to 10 amino acids, e.g., 1,2, 3, 4, 5, 6, 7, 8, 9, or 10, from the mature polypeptide of SEQ ID NO:2 or the mature polypeptide of SEQ ID NO: 4.

A polypeptide of the present invention preferably comprises or consistsof the amino acid sequence of SEQ ID NO: 2 or SEQ ID NO: 4 or an allelicvariant thereof; or is a fragment thereof having cellulolytic enhancingactivity. In another aspect, the polypeptide comprises or consists ofthe mature polypeptide of SEQ ID NO: 2. In another aspect, thepolypeptide comprises or consists of amino acids 22 to 251 of SEQ ID NO:2. In another aspect, the polypeptide comprises or consists of themature polypeptide of SEQ ID NO: 4. In another aspect, the polypeptidecomprises or consists of amino acids 24 to 366 of SEQ ID NO: 4.

In another embodiment, the present invention relates to isolatedpolypeptides having cellulolytic enhancing activity encoded bypolynucleotides that hybridize under very low stringency conditions, lowstringency conditions, medium stringency conditions, medium-highstringency conditions, high stringency conditions, or very highstringency conditions with (i) SEQ ID NO: 1 or SEQ ID NO: 3; (ii) themature polypeptide coding sequence of SEQ ID NO: 1 or SEQ ID NO: 3;(iii) the cDNA sequence of SEQ ID NO: 1 or the mature polypeptide codingsequence thereof; (iv) the full-length complement thereof; or (v) asubsequence thereof (Sambrook et al., 1989, Molecular Cloning, ALaboratory Manual, 2d edition, Cold Spring Harbor, New York).

The polynucleotide of SEQ ID NO: 1 or SEQ ID NO: 3, or a subsequencethereof, as well as the polypeptide of SEQ ID NO: 2 or SEQ ID NO: 4, ora fragment thereof, may be used to design nucleic acid probes toidentify and clone DNA encoding polypeptides having cellulolyticenhancing activity from strains of different genera or species accordingto methods well known in the art. In particular, such probes can be usedfor hybridization with the genomic DNA or cDNA of a cell of interest,following standard Southern blotting procedures, in order to identifyand isolate the corresponding gene therein. Such probes can beconsiderably shorter than the entire sequence, but should be at least15, e.g., at least 25, at least 35, or at least 70 nucleotides inlength. Preferably, the nucleic acid probe is at least 100 nucleotidesin length, e.g., at least 200 nucleotides, at least 300 nucleotides, atleast 400 nucleotides, at least 500 nucleotides, at least 600nucleotides, at least 700 nucleotides, at least 800 nucleotides, or atleast 900 nucleotides in length. Both DNA and RNA probes can be used.The probes are typically labeled for detecting the corresponding gene(for example, with ³²P, ³H, ³⁵S, biotin, or avidin). Such probes areencompassed by the present invention.

A genomic DNA or cDNA library prepared from such other strains may bescreened for DNA that hybridizes with the probes described above andencodes a polypeptide having cellulolytic enhancing activity. Genomic orother DNA from such other strains may be separated by agarose orpolyacrylamide gel electrophoresis, or other separation techniques. DNAfrom the libraries or the separated DNA may be transferred to andimmobilized on nitrocellulose or other suitable carrier material. Inorder to identify a clone or DNA that hybridizes with SEQ ID NO: 1 orthe cDNA sequence thereof or SEQ ID NO: 3, the mature polypeptide codingsequence thereof, or a subsequence thereof, the carrier material is usedin a Southern blot.

For purposes of the present invention, hybridization indicates that thepolynucleotides hybridize to a labeled nucleic acid probe correspondingto (i) SEQ ID NO: 1 or SEQ ID NO: 3; (ii) the mature polypeptide codingsequence of SEQ ID NO: 1 or SEQ ID NO: 3; (iii) the cDNA sequence of SEQID NO: 1 or the mature polypeptide coding sequence thereof; (iv) thefull-length complement thereof; or (v) a subsequence thereof; under verylow to very high stringency conditions. Molecules to which the nucleicacid probe hybridizes under these conditions can be detected using, forexample, X-ray film or any other detection means known in the art.

In one aspect, the nucleic acid probe is a polynucleotide that encodesthe polypeptide of SEQ ID NO: 2; the mature polypeptide thereof; or afragment thereof. In another aspect, the nucleic acid probe is SEQ IDNO: 1; the mature polypeptide coding sequence thereof; or the cDNAsequence thereof. In another aspect, the nucleic acid probe is apolynucleotide that encodes the polypeptide of SEQ ID NO: 4; the maturepolypeptide thereof; or a fragment thereof. In another aspect, thenucleic acid probe is SEQ ID NO: 3 or the mature polypeptide codingsequence thereof. In another aspect, the nucleic acid probe is thepolynucleotide contained in Talaromyces leycettanus CBS 398.68, whereinthe polynucleotide encodes a polypeptide having cellulolytic enhancingactivity. In another aspect, the nucleic acid probe is the maturepolypeptide coding region contained in Talaromyces leycettanus CBS398.68.

In another embodiment, the present invention relates to isolatedpolypeptides having cellulolytic enhancing activity encoded bypolynucleotides having a sequence identity to the mature polypeptidecoding sequence of SEQ ID NO: 1 or the cDNA sequence thereof of at leastat least 70%, e.g., at least 75%, at least 80%, at least 81%, at least82%, at least 83%, at least 84%, at least 85%, at least 86%, at least87%, at least 88%, at least 89%, at least 90%, at least 91%, at least92%, at least 93%, at least 94%, at least 95%, at least 96%, at least97%, at least 98%, at least 99%, or 100%; or the mature polypeptidecoding sequence of SEQ ID NO: 3 of at least at least 80%, e.g., at least81%, at least 82%, at least 83%, at least 84%, at least 85%, at least86%, at least 87%, at least 88%, at least 89%, at least 90%, at least91%, at least 92%, at least 93%, at least 94%, at least 95%, at least96%, at least 97%, at least 98%, at least 99%, or 100%.

In another embodiment, the present invention relates to variants of themature polypeptide of SEQ ID NO: 2 or the mature polypeptide of SEQ IDNO: 4 comprising a substitution, deletion, and/or insertion at one ormore (e.g., several) positions. In one aspect, the number of amino acidsubstitutions, deletions and/or insertions introduced into the maturepolypeptide of SEQ ID NO: 2 or the mature polypeptide of SEQ ID NO: 4 isup to 10, e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10. The amino acid changesmay be of a minor nature, that is conservative amino acid substitutionsor insertions that do not significantly affect the folding and/oractivity of the protein; small deletions, typically of 1-30 amino acids;small amino- or carboxyl-terminal extensions, such as an amino-terminalmethionine residue; a small linker peptide of up to 20-25 residues; or asmall extension that facilitates purification by changing net charge oranother function, such as a poly-histidine tract, an antigenic epitopeor a binding domain.

Examples of conservative substitutions are within the groups of basicamino acids (arginine, lysine and histidine), acidic amino acids(glutamic acid and aspartic acid), polar amino acids (glutamine andasparagine), hydrophobic amino acids (leucine, isoleucine and valine),aromatic amino acids (phenylalanine, tryptophan and tyrosine), and smallamino acids (glycine, alanine, serine, threonine and methionine). Aminoacid substitutions that do not generally alter specific activity areknown in the art and are described, for example, by H. Neurath and R. L.Hill, 1979, In, The Proteins, Academic Press, New York. Commonsubstitutions are Ala/Ser, Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr,Ser/Asn, Ala/Val, Ser/Gly, Tyr/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile,Leu/Val, Ala/Glu, and Asp/Gly.

Alternatively, the amino acid changes are of such a nature that thephysico-chemical properties of the polypeptides are altered. Forexample, amino acid changes may improve the thermal stability of thepolypeptide and/or thermal activity of the polypeptide, alter thesubstrate specificity, change the pH optimum, and the like.

Essential amino acids in a polypeptide can be identified according toprocedures known in the art, such as site-directed mutagenesis oralanine-scanning mutagenesis (Cunningham and Wells, 1989, Science 244:1081-1085). In the latter technique, single alanine mutations areintroduced at every residue in the molecule, and the resultant mutantmolecules are tested for cellulolytic enhancing activity to identifyamino acid residues that are critical to the activity of the molecule.See also, Hilton et al., 1996, J. Biol. Chem. 271: 4699-4708. The activesite of the enzyme or other biological interaction can also bedetermined by physical analysis of structure, as determined by suchtechniques as nuclear magnetic resonance, crystallography, electrondiffraction, or photoaffinity labeling, in conjunction with mutation ofputative contact site amino acids. See, for example, de Vos et al.,1992, Science 255: 306-312; Smith et al., 1992, J. Mol. Biol. 224:899-904; Wlodaver et al., 1992, FEBS Lett. 309: 59-64. The identity ofessential amino acids can also be inferred from an alignment with arelated polypeptide.

Single or multiple amino acid substitutions, deletions, and/orinsertions can be made and tested using known methods of mutagenesis,recombination, and/or shuffling, followed by a relevant screeningprocedure, such as those disclosed by Reidhaar-Olson and Sauer, 1988,Science 241: 53-57; Bowie and Sauer, 1989, Proc. Natl. Acad. Sci. USA86: 2152-2156; WO 95/17413; or WO 95/22625. Other methods that can beused include error-prone PCR, phage display (e.g., Lowman et al., 1991,Biochemistry 30: 10832-10837; U.S. Pat. No. 5,223,409; WO 92/06204), andregion-directed mutagenesis (Derbyshire et al., 1986, Gene 46: 145; Neret al., 1988, DNA 7: 127).

Mutagenesis/shuffling methods can be combined with high-throughput,automated screening methods to detect activity of cloned, mutagenizedpolypeptides expressed by host cells (Ness et al., 1999, NatureBiotechnology 17: 893-896). Mutagenized DNA molecules that encode activepolypeptides can be recovered from the host cells and rapidly sequencedusing standard methods in the art. These methods allow the rapiddetermination of the importance of individual amino acid residues in apolypeptide.

The polypeptide may be a hybrid polypeptide in which a region of onepolypeptide is fused at the N-terminus or the C-terminus of a region ofanother polypeptide.

The polypeptide may be a fusion polypeptide or cleavable fusionpolypeptide in which another polypeptide is fused at the N-terminus orthe C-terminus of the polypeptide of the present invention. A fusionpolypeptide is produced by fusing a polynucleotide encoding anotherpolypeptide to a polynucleotide of the present invention. Techniques forproducing fusion polypeptides are known in the art, and include ligatingthe coding sequences encoding the polypeptides so that they are in frameand that expression of the fusion polypeptide is under control of thesame promoter(s) and terminator. Fusion polypeptides may also beconstructed using intein technology in which fusion polypeptides arecreated post-translationally (Cooper et al., 1993, EMBO J. 12:2575-2583; Dawson et al., 1994, Science 266: 776-779).

A fusion polypeptide can further comprise a cleavage site between thetwo polypeptides. Upon secretion of the fusion protein, the site iscleaved releasing the two polypeptides. Examples of cleavage sitesinclude, but are not limited to, the sites disclosed in Martin et al.,2003, J. Ind. Microbiol. Biotechnol. 3: 568-576; Svetina et al., 2000,J. Biotechnol. 76: 245-251; Rasmussen-Wilson et al., 1997, Appl.Environ. Microbiol. 63: 3488-3493; Ward et al., 1995, Biotechnology 13:498-503; and Contreras et al., 1991, Biotechnology 9: 378-381; Eaton etal., 1986, Biochemistry 25: 505-512; Collins-Racie et al., 1995,Biotechnology 13: 982-987; Carter et al., 1989, Proteins: Structure,Function, and Genetics 6: 240-248; and Stevens, 2003, Drug DiscoveryWorld 4: 35-48.

Sources of Polypeptides Having Cellulolytic Enhancing Activity

A polypeptide having cellulolytic enhancing activity of the presentinvention may be obtained from microorganisms of any genus. For purposesof the present invention, the term “obtained from” as used herein inconnection with a given source shall mean that the polypeptide encodedby a polynucleotide is produced by the source or by a strain in whichthe polynucleotide from the source has been inserted. In one aspect, thepolypeptide obtained from a given source is secreted extracellularly.

The polypeptide may be a fungal polypeptide. In one aspect, thepolypeptide is a Talaromyces polypeptide. In another aspect, thepolypeptide is a Talaromyces leycettanus polypeptide. In another aspect,the polypeptide is a Talaromyces leycettanus CBS 398.68 polypeptide.

It will be understood that for the aforementioned species, the inventionencompasses both the perfect and imperfect states, and other taxonomicequivalents, e.g., anamorphs, regardless of the species name by whichthey are known. Those skilled in the art will readily recognize theidentity of appropriate equivalents.

Strains of these species are readily accessible to the public in anumber of culture collections, such as the American Type CultureCollection (ATCC), Deutsche Sammlung von Mikroorganismen andZellkulturen GmbH (DSMZ), Centraalbureau Voor Schimmelcultures (CBS),and Agricultural Research Service Patent Culture Collection, NorthernRegional Research Center (NRRL).

A polypeptide may be identified and obtained from other sourcesincluding microorganisms isolated from nature (e.g., soil, composts,water, etc.) or DNA samples obtained directly from natural materials(e.g., soil, composts, water, etc.) using the above-mentioned probes.Techniques for isolating microorganisms and DNA directly from naturalhabitats are well known in the art. A polynucleotide encoding thepolypeptide may then be obtained by similarly screening a genomic DNA orcDNA library of another microorganism or mixed DNA sample. Once apolynucleotide encoding a polypeptide has been detected with theprobe(s), the polynucleotide can be isolated or cloned by utilizingtechniques that are known to those of ordinary skill in the art (see,e.g., Sambrook et al., 1989, supra).

Catalytic Domains

In one embodiment, the present invention also relates to catalyticdomains having a sequence identity to amino acids 24 to 242 of SEQ IDNO: 4 of at least 75%, e.g., at least 80%, at least 81%, at least 82%,at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, atleast 88%, at least 89%, at least 90%, at least 91%, at least 92%, atleast 93%, at least 94%, at least 95%, at least 96%, at least 97%, atleast 98%, at least 99%, or 100%. In one aspect, the catalytic domainscomprise amino acid sequences that differ by up to 10 amino acids, e.g.,1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, from amino acids 24 to 242 of SEQ IDNO: 4.

The catalytic domain preferably comprises or consists of amino acids 24to 242 of SEQ ID NO: 4, or an allelic variant thereof; or is a fragmentthereof having cellulolytic enhancing activity.

In another embodiment, the present invention also relates to catalyticdomains encoded by polynucleotides that hybridize under very lowstringency conditions, low stringency conditions, medium stringencyconditions, medium-high stringency conditions, high stringencyconditions, or very high stringency conditions (as defined above) withnucleotides 70 to 726 of SEQ ID NO: 3, or the full-length complementthereof (Sambrook et al., 1989, supra).

In another embodiment, the present invention also relates to catalyticdomains encoded by polynucleotides having a sequence identity tonucleotides 70 to 726 of SEQ ID NO: 3 of at least 75%, e.g., at least80%, at least 81%, at least 82%, at least 83%, at least 84%, at least85%, at least 86%, at least 87%, at least 88%, at least 89%, at least90%, at least 91%, at least 92%, at least 93%, at least 94%, at least95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%.

The polynucleotide encoding the catalytic domain preferably comprises orconsists of nucleotides 70 to 726 of SEQ ID NO: 3, or is the sequencecontained in Talaromyces leycettanus CBS 398.68.

In another embodiment, the present invention also relates to catalyticdomain variants of amino acids 24 to 242 of SEQ ID NO: 4 comprising asubstitution, deletion, and/or insertion at one or more (e.g., several)positions. In one aspect, the number of amino acid substitutions,deletions and/or insertions introduced into the sequence of amino acids24 to 242 of SEQ ID NO: 4 is up to 10, e.g., 1, 2, 3, 4, 5, 6, 8, 9, or10.

Binding Domains

In one embodiment, the present invention also relates to carbohydratebinding domains having a sequence identity to amino acids 326 to 366 ofSEQ ID NO: 4 of at 80%, e.g., at least 81%, at least 82%, at least 83%,at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, atleast 89%, at least 90%, at least 91%, at least 92%, at least 93%, atleast 94%, at least 95%, at least 96%, at least 97%, at least 98%, atleast 99%, or 100%. In one aspect, the carbohydrate binding domainscomprise amino acid sequences that differ by up to 10 amino acids, e.g.,1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, from amino acids 326 to 366 of SEQ IDNO: 4.

The carbohydrate binding domain preferably comprises or consists ofamino acids 326 to 366 of SEQ ID NO: 4, or an allelic variant thereof;or is a fragment thereof having cellulose binding activity.

In another embodiment, the present invention also relates tocarbohydrate binding domains encoded by polynucleotides that hybridizeunder very low stringency conditions, low stringency conditions, mediumstringency conditions, medium-high stringency conditions, highstringency conditions, or very high stringency conditions (as definedabove) with nucleotides 976 to 1098 of SEQ ID NO: 3 or the full-lengthcomplement thereof (Sambrook et al., 1989, supra).

In another embodiment, the present invention also relates tocarbohydrate binding domains encoded by polynucleotides having asequence identity to nucleotides 976 to 1098 of SEQ ID NO: 3 of at least80%, e.g., at least 81%, at least 82%, at least 83%, at least 84%, atleast 85%, at least 86%, at least 87%, at least 88%, at least 89%, atleast 90%, at least 91%, at least 92%, at least 93%, at least 94%, atleast 95%, at least 96%, at least 97%, at least 98%, at least 99%, or100%.

The polynucleotide encoding the carbohydrate binding domain preferablycomprises or consists of nucleotides 976 to 1098 of SEQ ID NO: 3, or isthe sequence contained in Talaromyces leycettanus CBS 398.68.

In another embodiment, the present invention also relates tocarbohydrate binding domain variants of amino acids 326 to 366 of SEQ IDNO: 4 comprising a substitution, deletion, and/or insertion at one ormore (e.g., several) positions. In one aspect, the number of amino acidsubstitutions, deletions and/or insertions introduced into the sequenceof amino acids 326 to 366 of SEQ ID NO: 4 is up to 10, e.g., 1, 2, 3, 4,5, 6, 8, 9, or 10.

A catalytic domain operably linked to the carbohydrate binding domainmay be from a hydrolase, isomerase, ligase, lyase, oxidoreductase, ortransferase, e.g., an aminopeptidase, amylase, carbohydrase,carboxypeptidase, catalase, cellobiohydrolase, cellulase, chitinase,cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease,endoglucanase, esterase, alpha-galactosidase, beta-galactosidase,glucoamylase, alpha-glucosidase, beta-glucosidase, invertase, laccase,lipase, mannosidase, mutanase, oxidase, pectinolytic enzyme, peroxidase,phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease,transglutaminase, xylanase, or beta-xylosidase. The polynucleotideencoding the catalytic domain may be obtained from any prokaryotic,eukaryotic, or other source.

Polynucleotides

The present invention also relates to isolated polynucleotides encodinga polypeptide, a catalytic domain, or a carbohydrate binding domain ofthe present invention, as described herein.

The techniques used to isolate or clone a polynucleotide are known inthe art and include isolation from genomic DNA or cDNA, or a combinationthereof. The cloning of the polynucleotides from genomic DNA can beeffected, e.g., by using the well-known polymerase chain reaction (PCR)or antibody screening of expression libraries to detect cloned DNAfragments with shared structural features. See, e.g., Innis et al.,1990, PCR: A Guide to Methods and Application, Academic Press, New York.Other nucleic acid amplification procedures such as ligase chainreaction (LCR), ligation activated transcription (LAT) andpolynucleotide-based amplification (NASBA) may be used. Thepolynucleotides may be cloned from a strain of Talaromyces, or a relatedorganism and thus, for example, may be an allelic or species variant ofthe polypeptide encoding region of the polynucleotide.

Modification of a polynucleotide encoding a polypeptide of the presentinvention may be necessary for synthesizing polypeptides substantiallysimilar to the polypeptide. The term “substantially similar” to thepolypeptide refers to non-naturally occurring forms of the polypeptide.These polypeptides may differ in some engineered way from thepolypeptide isolated from its native source, e.g., variants that differin specific activity, thermostability, pH optimum, or the like. Thevariants may be constructed on the basis of the polynucleotide presentedas the mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof or the mature polypeptide coding sequence of SEQ ID NO:3, by introduction of nucleotide substitutions that do not result in achange in the amino acid sequence of the polypeptide, but whichcorrespond to the codon usage of the host organism intended forproduction of the enzyme, or by introduction of nucleotide substitutionsthat may give rise to a different amino acid sequence. For a generaldescription of nucleotide substitution, see, e.g., Ford et al., 1991,Protein Expression and Purification 2: 95-107.

Nucleic Acid Constructs

The present invention also relates to nucleic acid constructs comprisinga polynucleotide of the present invention operably linked to one or morecontrol sequences that direct the expression of the coding sequence in asuitable host cell under conditions compatible with the controlsequences.

The polynucleotide may be manipulated in a variety of ways to providefor expression of the polypeptide. Manipulation of the polynucleotideprior to its insertion into a vector may be desirable or necessarydepending on the expression vector. The techniques for modifyingpolynucleotides utilizing recombinant DNA methods are well known in theart.

The control sequence may be a promoter, a polynucleotide that isrecognized by a host cell for expression of a polynucleotide encoding apolypeptide of the present invention. The promoter containstranscriptional control sequences that mediate the expression of thepolypeptide. The promoter may be any polynucleotide that showstranscriptional activity in the host cell including mutant, truncated,and hybrid promoters, and may be obtained from genes encodingextracellular or intracellular polypeptides either homologous orheterologous to the host cell.

Examples of suitable promoters for directing transcription of thenucleic acid constructs of the present invention in a bacterial hostcell are the promoters obtained from the Bacillus amyloliquefaciensalpha-amylase gene (amyQ), Bacillus licheniformis alpha-amylase gene(amyL), Bacillus licheniformis penicillinase gene (penP), Bacillusstearothermophilus maltogenic amylase gene (amyM), Bacillus subtilislevansucrase gene (sacB), Bacillus subtilis xylA and xylB genes,Bacillus thuringiensis cryIIIA gene (Agaisse and Lereclus, 1994,Molecular Microbiology 13: 97-107), E. coli lac operon, E. coli trcpromoter (Egon et al., 1988, Gene 69: 301-315), Streptomyces coelicoloragarase gene (dagA), and prokaryotic beta-lactamase gene (Villa-Kamaroffet al., 1978, Proc. Natl. Acad. Sci. USA 75: 3727-3731), as well as thetac promoter (DeBoer et al., 1983, Proc. Natl. Acad. Sci. USA 80:21-25). Further promoters are described in “Useful proteins fromrecombinant bacteria” in Gilbert et al., 1980, Scientific American 242:74-94; and in Sambrook et al., 1989, supra. Examples of tandem promotersare disclosed in WO 99/43835.

Examples of suitable promoters for directing transcription of thenucleic acid constructs of the present invention in a filamentous fungalhost cell are promoters obtained from the genes for Aspergillus nidulansacetamidase, Aspergillus niger neutral alpha-amylase, Aspergillus nigeracid stable alpha-amylase, Aspergillus niger or Aspergillus awamoriglucoamylase (glaA), Aspergillus oryzae TAKA amylase, Aspergillus oryzaealkaline protease, Aspergillus oryzae triose phosphate isomerase,Fusarium oxysporum trypsin-like protease (WO 96/00787), Fusariumvenenatum amyloglucosidase (WO 00/56900), Fusarium venenatum Daria (WO00/56900), Fusarium venenatum Quinn (WO 00/56900), Rhizomucor mieheilipase, Rhizomucor miehei aspartic proteinase, Trichoderma reeseibeta-glucosidase, Trichoderma reesei cellobiohydrolase I, Trichodermareesei cellobiohydrolase II, Trichoderma reesei endoglucanase I,Trichoderma reesei endoglucanase II, Trichoderma reesei endoglucanaseIII, Trichoderma reesei endoglucanase V, Trichoderma reesei xylanase I,Trichoderma reesei xylanase II, Trichoderma reesei xylanase III,Trichoderma reesei beta-xylosidase, and Trichoderma reesei translationelongation factor, as well as the NA2-tpi promoter (a modified promoterfrom an Aspergillus neutral alpha-amylase gene in which the untranslatedleader has been replaced by an untranslated leader from an Aspergillustriose phosphate isomerase gene; non-limiting examples include modifiedpromoters from an Aspergillus niger neutral alpha-amylase gene in whichthe untranslated leader has been replaced by an untranslated leader froman Aspergillus nidulans or Aspergillus oryzae triose phosphate isomerasegene); and mutant, truncated, and hybrid promoters thereof. Otherpromoters are described in U.S. Pat. No. 6,011,147.

In a yeast host, useful promoters are obtained from the genes forSaccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiaegalactokinase (GAL1), Saccharomyces cerevisiae alcoholdehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH1, ADH2/GAP),Saccharomyces cerevisiae triose phosphate isomerase (TPI), Saccharomycescerevisiae metallothionein (CUP1), and Saccharomyces cerevisiae3-phosphoglycerate kinase. Other useful promoters for yeast host cellsare described by Romanos et al., 1992, Yeast 8: 423-488.

The control sequence may also be a transcription terminator, which isrecognized by a host cell to terminate transcription. The terminator isoperably linked to the 3′-terminus of the polynucleotide encoding thepolypeptide. Any terminator that is functional in the host cell may beused in the present invention.

Preferred terminators for bacterial host cells are obtained from thegenes for Bacillus clausii alkaline protease (aprH), Bacilluslicheniformis alpha-amylase (amyL), and Escherichia coli ribosomal RNA(rrnB).

Preferred terminators for filamentous fungal host cells are obtainedfrom the genes for Aspergillus nidulans acetamidase, Aspergillusnidulans anthranilate synthase, Aspergillus niger glucoamylase,Aspergillus niger alpha-glucosidase, Aspergillus oryzae TAKA amylase,Fusarium oxysporum trypsin-like protease, Trichoderma reeseibeta-glucosidase, Trichoderma reesei cellobiohydrolase I, Trichodermareesei cellobiohydrolase II, Trichoderma reesei endoglucanase I,Trichoderma reesei endoglucanase II, Trichoderma reesei endoglucanaseIII, Trichoderma reesei endoglucanase V, Trichoderma reesei xylanase I,Trichoderma reesei xylanase II, Trichoderma reesei xylanase III,Trichoderma reesei beta-xylosidase, and Trichoderma reesei translationelongation factor.

Preferred terminators for yeast host cells are obtained from the genesfor Saccharomyces cerevisiae enolase, Saccharomyces cerevisiaecytochrome C (CYC1), and Saccharomyces cerevisiaeglyceraldehyde-3-phosphate dehydrogenase. Other useful terminators foryeast host cells are described by Romanos et al., 1992, supra.

The control sequence may also be an mRNA stabilizer region downstream ofa promoter and upstream of the coding sequence of a gene which increasesexpression of the gene.

Examples of suitable mRNA stabilizer regions are obtained from aBacillus thuringiensis cryIIIA gene (WO 94/25612) and a Bacillussubtilis SP82 gene (Hue et al., 1995, Journal of Bacteriology 177:3465-3471).

The control sequence may also be a leader, a nontranslated region of anmRNA that is important for translation by the host cell. The leader isoperably linked to the 5′-terminus of the polynucleotide encoding thepolypeptide. Any leader that is functional in the host cell may be used.

Preferred leaders for filamentous fungal host cells are obtained fromthe genes for Aspergillus oryzae TAKA amylase and Aspergillus nidulanstriose phosphate isomerase.

Suitable leaders for yeast host cells are obtained from the genes forSaccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae3-phosphoglycerate kinase, Saccharomyces cerevisiae alpha-factor, andSaccharomyces cerevisiae alcoholdehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH2/GAP).

The control sequence may also be a polyadenylation sequence, a sequenceoperably linked to the 3′-terminus of the polynucleotide and, whentranscribed, is recognized by the host cell as a signal to addpolyadenosine residues to transcribed mRNA. Any polyadenylation sequencethat is functional in the host cell may be used.

Preferred polyadenylation sequences for filamentous fungal host cellsare obtained from the genes for Aspergillus nidulans anthranilatesynthase, Aspergillus nigerglucoamylase, Aspergillus nigeralpha-glucosidase Aspergillus oryzae TAKA amylase, and Fusariumoxysporum trypsin-like protease.

Useful polyadenylation sequences for yeast host cells are described byGuo and Sherman, 1995, Mol. Cellular Biol. 15: 5983-5990.

The control sequence may also be a signal peptide coding region thatencodes a signal peptide linked to the N-terminus of a polypeptide anddirects the polypeptide into the cell's secretory pathway. The 5′-end ofthe coding sequence of the polynucleotide may inherently contain asignal peptide coding sequence naturally linked in translation readingframe with the segment of the coding sequence that encodes thepolypeptide. Alternatively, the 5′-end of the coding sequence maycontain a signal peptide coding sequence that is foreign to the codingsequence. A foreign signal peptide coding sequence may be required wherethe coding sequence does not naturally contain a signal peptide codingsequence. Alternatively, a foreign signal peptide coding sequence maysimply replace the natural signal peptide coding sequence in order toenhance secretion of the polypeptide. However, any signal peptide codingsequence that directs the expressed polypeptide into the secretorypathway of a host cell may be used.

Effective signal peptide coding sequences for bacterial host cells arethe signal peptide coding sequences obtained from the genes for BacillusNCIB 11837 maltogenic amylase, Bacillus licheniformis subtilisin,Bacillus licheniformis beta-lactamase, Bacillus stearothermophilusalpha-amylase, Bacillus stearothermophilus neutral proteases (nprT,nprS, nprM), and Bacillus subtilis prsA. Further signal peptides aredescribed by Simonen and Palva, 1993, Microbiological Reviews 57:109-137.

Effective signal peptide coding sequences for filamentous fungal hostcells are the signal peptide coding sequences obtained from the genesfor Aspergillus niger neutral amylase, Aspergillus niger glucoamylase,Aspergillus oryzae TAKA amylase, Humicola insolens cellulase, Humicolainsolens endoglucanase V, Humicola lanuginosa lipase, and Rhizomucormiehei aspartic proteinase.

Useful signal peptides for yeast host cells are obtained from the genesfor Saccharomyces cerevisiae alpha-factor and Saccharomyces cerevisiaeinvertase. Other useful signal peptide coding sequences are described byRomanos et al., 1992, supra.

The control sequence may also be a propeptide coding sequence thatencodes a propeptide positioned at the N-terminus of a polypeptide. Theresultant polypeptide is known as a proenzyme or propolypeptide (or azymogen in some cases). A propolypeptide is generally inactive and canbe converted to an active polypeptide by catalytic or autocatalyticcleavage of the propeptide from the propolypeptide. The propeptidecoding sequence may be obtained from the genes for Bacillus subtilisalkaline protease (aprE), Bacillus subtilis neutral protease (nprT),Myceliophthora thermophila laccase (WO 95/33836), Rhizomucor mieheiaspartic proteinase, and Saccharomyces cerevisiae alpha-factor.

Where both signal peptide and propeptide sequences are present, thepropeptide sequence is positioned next to the N-terminus of apolypeptide and the signal peptide sequence is positioned next to theN-terminus of the propeptide sequence.

It may also be desirable to add regulatory sequences that regulateexpression of the polypeptide relative to the growth of the host cell.Examples of regulatory sequences are those that cause expression of thegene to be turned on or off in response to a chemical or physicalstimulus, including the presence of a regulatory compound. Regulatorysequences in prokaryotic systems include the lac, tac, and trp operatorsystems. In yeast, the ADH2 system or GAL1 system may be used. Infilamentous fungi, the Aspergillus niger glucoamylase promoter,Aspergillus oryzae TAKA alpha-amylase promoter, and Aspergillus oryzaeglucoamylase promoter, Trichoderma reesei cellobiohydrolase I promoter,and Trichoderma reesei cellobiohydrolase II promoter may be used. Otherexamples of regulatory sequences are those that allow for geneamplification. In eukaryotic systems, these regulatory sequences includethe dihydrofolate reductase gene that is amplified in the presence ofmethotrexate, and the metallothionein genes that are amplified withheavy metals. In these cases, the polynucleotide encoding thepolypeptide would be operably linked to the regulatory sequence.

Expression Vectors

The present invention also relates to recombinant expression vectorscomprising a polynucleotide of the present invention, a promoter, andtranscriptional and translational stop signals. The various nucleotideand control sequences may be joined together to produce a recombinantexpression vector that may include one or more convenient restrictionsites to allow for insertion or substitution of the polynucleotideencoding the polypeptide at such sites. Alternatively, thepolynucleotide may be expressed by inserting the polynucleotide or anucleic acid construct comprising the polynucleotide into an appropriatevector for expression. In creating the expression vector, the codingsequence is located in the vector so that the coding sequence isoperably linked with the appropriate control sequences for expression.

The recombinant expression vector may be any vector (e.g., a plasmid orvirus) that can be conveniently subjected to recombinant DNA proceduresand can bring about expression of the polynucleotide. The choice of thevector will typically depend on the compatibility of the vector with thehost cell into which the vector is to be introduced. The vector may be alinear or closed circular plasmid.

The vector may be an autonomously replicating vector, i.e., a vectorthat exists as an extrachromosomal entity, the replication of which isindependent of chromosomal replication, e.g., a plasmid, anextrachromosomal element, a minichromosome, or an artificial chromosome.The vector may contain any means for assuring self-replication.Alternatively, the vector may be one that, when introduced into the hostcell, is integrated into the genome and replicated together with thechromosome(s) into which it has been integrated. Furthermore, a singlevector or plasmid or two or more vectors or plasmids that togethercontain the total DNA to be introduced into the genome of the host cell,or a transposon, may be used.

The vector preferably contains one or more selectable markers thatpermit easy selection of transformed, transfected, transduced, or thelike cells. A selectable marker is a gene the product of which providesfor biocide or viral resistance, resistance to heavy metals, prototrophyto auxotrophs, and the like.

Examples of bacterial selectable markers are Bacillus licheniformis orBacillus subtilis dal genes, or markers that confer antibioticresistance such as ampicillin, chloramphenicol, kanamycin, neomycin,spectinomycin, or tetracycline resistance. Suitable markers for yeasthost cells include, but are not limited to, ADE2, HIS3, LEU2, LYS2,MET3, TRP1, and URA3. Selectable markers for use in a filamentous fungalhost cell include, but are not limited to, adeA(phosphoribosylaminoimidazole-succinocarboxamide synthase), adeB(phosphoribosyl-aminoimidazole synthase), amdS (acetamidase), argB(ornithine carbamoyltransferase), bar (phosphinothricinacetyltransferase), hph (hygromycin phosphotransferase), niaD (nitratereductase), pyrG (orotidine-5′-phosphate decarboxylase), sC (sulfateadenyltransferase), and trpC (anthranilate synthase), as well asequivalents thereof. Preferred for use in an Aspergillus cell areAspergillus nidulans or Aspergillus oryzae amdS and pyrG genes and aStreptomyces hygroscopicus bar gene. Preferred for use in a Trichodermacell are adeA, adeB, amdS, hph, and pyrG genes.

The selectable marker may be a dual selectable marker system asdescribed in WO 2010/039889. In one aspect, the dual selectable markeris an hph-tk dual selectable marker system.

The vector preferably contains an element(s) that permits integration ofthe vector into the host cell's genome or autonomous replication of thevector in the cell independent of the genome.

For integration into the host cell genome, the vector may rely on thepolynucleotide's sequence encoding the polypeptide or any other elementof the vector for integration into the genome by homologous ornon-homologous recombination. Alternatively, the vector may containadditional polynucleotides for directing integration by homologousrecombination into the genome of the host cell at a precise location(s)in the chromosome(s). To increase the likelihood of integration at aprecise location, the integrational elements should contain a sufficientnumber of nucleic acids, such as 100 to 10,000 base pairs, 400 to 10,000base pairs, and 800 to 10,000 base pairs, which have a high degree ofsequence identity to the corresponding target sequence to enhance theprobability of homologous recombination. The integrational elements maybe any sequence that is homologous with the target sequence in thegenome of the host cell. Furthermore, the integrational elements may benon-encoding or encoding polynucleotides. On the other hand, the vectormay be integrated into the genome of the host cell by non-homologousrecombination.

For autonomous replication, the vector may further comprise an origin ofreplication enabling the vector to replicate autonomously in the hostcell in question. The origin of replication may be any plasmidreplicator mediating autonomous replication that functions in a cell.The term “origin of replication” or “plasmid replicator” means apolynucleotide that enables a plasmid or vector to replicate in vivo.

Examples of bacterial origins of replication are the origins ofreplication of plasmids pBR322, pUC19, pACYC177, and pACYC184 permittingreplication in E. coli, and pUB110, pE194, pTA1060, and pAMβ1 permittingreplication in Bacillus.

Examples of origins of replication for use in a yeast host cell are the2 micron origin of replication, ARS1, ARS4, the combination of ARS1 andCEN3, and the combination of ARS4 and CEN6.

Examples of origins of replication useful in a filamentous fungal cellare AMA1 and ANS1 (Gems et al., 1991, Gene 98: 61-67; Cullen et al.,1987, Nucleic Acids Res. 15: 9163-9175; WO 00/24883). Isolation of theAMA1 gene and construction of plasmids or vectors comprising the genecan be accomplished according to the methods disclosed in WO 00/24883.

More than one copy of a polynucleotide of the present invention may beinserted into a host cell to increase production of a polypeptide. Anincrease in the copy number of the polynucleotide can be obtained byintegrating at least one additional copy of the sequence into the hostcell genome or by including an amplifiable selectable marker gene withthe polynucleotide where cells containing amplified copies of theselectable marker gene, and thereby additional copies of thepolynucleotide, can be selected for by cultivating the cells in thepresence of the appropriate selectable agent.

The procedures used to ligate the elements described above to constructthe recombinant expression vectors of the present invention are wellknown to one skilled in the art (see, e.g., Sambrook et al., 1989,supra).

Host Cells

The present invention also relates to recombinant host cells, comprisinga polynucleotide of the present invention operably linked to one or morecontrol sequences that direct the production of a polypeptide of thepresent invention. A construct or vector comprising a polynucleotide isintroduced into a host cell so that the construct or vector ismaintained as a chromosomal integrant or as a self-replicatingextra-chromosomal vector as described earlier. The term “host cell”encompasses any progeny of a parent cell that is not identical to theparent cell due to mutations that occur during replication. The choiceof a host cell will to a large extent depend upon the gene encoding thepolypeptide and its source.

The host cell may be any cell useful in the recombinant production of apolypeptide of the present invention, e.g., a prokaryote or a eukaryote.

The prokaryotic host cell may be any Gram positive or Gram negativebacterium. Gram positive bacteria include, but are not limited to,Bacillus, Clostridium, Enterococcus, Geobacillus, Lactobacillus,Lactococcus, Oceanobacillus, Staphylococcus, Streptococcus, andStreptomyces. Gram negative bacteria include, but are not limited to,Campylobacter, E. coli, Flavobacterium, Fusobacterium, Helicobacter,Ilyobacter, Neisseria, Pseudomonas, Salmonella, and Ureaplasma.

The bacterial host cell may be any Bacillus cell including, but notlimited to, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillusbrevis, Bacillus circulans, Bacillus clausii, Bacillus coagulans,Bacillus firmus, Bacillus lautus, Bacillus lentus, Bacilluslicheniformis, Bacillus megaterium, Bacillus pumilus, Bacillusstearothermophilus, Bacillus subtilis, and Bacillus thuringiensis cells.

The bacterial host cell may also be any Streptococcus cell including,but not limited to, Streptococcus equisimilis, Streptococcus pyogenes,Streptococcus uberis, and Streptococcus equi subsp. Zooepidemicus cells.

The bacterial host cell may also be any Streptomyces cell including, butnot limited to, Streptomyces achromogenes, Streptomyces avermitilis,Streptomyces coelicolor, Streptomyces griseus, and Streptomyces lividanscells.

The introduction of DNA into a Bacillus cell may be effected byprotoplast transformation (see, e.g., Chang and Cohen, 1979, Mol. Gen.Genet. 168: 111-115), competent cell transformation (see, e.g., Youngand Spizizen, 1961, J. Bacteriol. 81: 823-829, or Dubnau andDavidoff-Abelson, 1971, J. Mol. Biol. 56: 209-221), electroporation(see, e.g., Shigekawa and Dower, 1988, Biotechniques 6: 742-751), orconjugation (see, e.g., Koehler and Thorne, 1987, J. Bacteriol. 169:5271-5278). The introduction of DNA into an E. coli cell may be effectedby protoplast transformation (see, e.g., Hanahan, 1983, J. Mol. Biol.166: 557-580) or electroporation (see, e.g., Dower et al., 1988, NucleicAcids Res. 16: 6127-6145). The introduction of DNA into a Streptomycescell may be effected by protoplast transformation, electroporation (see,e.g., Gong et al., 2004, Folia Microbiol. (Praha) 49: 399-405),conjugation (see, e.g., Mazodier et al., 1989, J. Bacteriol. 171:3583-3585), or transduction (see, e.g., Burke et al., 2001, Proc. Natl.Acad. Sci. USA 98: 6289-6294). The introduction of DNA into aPseudomonas cell may be effected by electroporation (see, e.g., Choi etal., 2006, J. Microbiol. Methods 64: 391-397) or conjugation (see, e.g.,Pinedo and Smets, 2005, Appl. Environ. Microbiol. 71: 51-57). Theintroduction of DNA into a Streptococcus cell may be effected by naturalcompetence (see, e.g., Perry and Kuramitsu, 1981, Infect. Immun. 32:1295-1297), protoplast transformation (see, e.g., Catt and Jollick,1991, Microbios 68: 189-207), electroporation (see, e.g., Buckley etal., 1999, Appl. Environ. Microbiol. 65: 3800-3804), or conjugation(see, e.g., Clewell, 1981, Microbiol. Rev. 45: 409-436). However, anymethod known in the art for introducing DNA into a host cell can beused.

The host cell may also be a eukaryote, such as a mammalian, insect,plant, or fungal cell.

The host cell may be a fungal cell. “Fungi” as used herein includes thephyla Ascomycota, Basidiomycota, Chytridiomycota, and Zygomycota as wellas the Oomycota and all mitosporic fungi (as defined by Hawksworth etal., In, Ainsworth and Bisby's Dictionary of The Fungi, 8th edition,1995, CAB International, University Press, Cambridge, UK).

The fungal host cell may be a yeast cell. “Yeast” as used hereinincludes ascosporogenous yeast (Endomycetales), basidiosporogenousyeast, and yeast belonging to the Fungi Imperfecti (Blastomycetes).Since the classification of yeast may change in the future, for thepurposes of this invention, yeast shall be defined as described inBiology and Activities of Yeast (Skinner, Passmore, and Davenport,editors, Soc. App. Bacteriol. Symposium Series No. 9, 1980).

The yeast host cell may be a Candida, Hansenula, Kluyveromyces, Pichia,Saccharomyces, Schizosaccharomyces, or Yarrowia cell, such as aKluyveromyces lactis, Saccharomyces carlsbergensis, Saccharomycescerevisiae, Saccharomyces diastaticus, Saccharomyces douglasii,Saccharomyces kluyveri, Saccharomyces norbensis, Saccharomycesoviformis, or Yarrowia lipolytica cell.

The fungal host cell may be a filamentous fungal cell. “Filamentousfungi” include all filamentous forms of the subdivision Eumycota andOomycota (as defined by Hawksworth et al., 1995, supra). The filamentousfungi are generally characterized by a mycelial wall composed of chitin,cellulose, glucan, chitosan, mannan, and other complex polysaccharides.Vegetative growth is by hyphal elongation and carbon catabolism isobligately aerobic. In contrast, vegetative growth by yeasts such asSaccharomyces cerevisiae is by budding of a unicellular thallus andcarbon catabolism may be fermentative.

The filamentous fungal host cell may be an Acremonium, Aspergillus,Aureobasidium, Bjerkandera, Ceriporiopsis, Chrysosporium, Coprinus,Coriolus, Cryptococcus, Filibasidium, Fusarium, Humicola, Magnaporthe,Mucor, Myceliophthora, Neocallimastix, Neurospora, Paecilomyces,Penicillium, Phanerochaete, Phlebia, Piromyces, Pleurotus,Schizophyllum, Talaromyces, Thermoascus, Thielavia, Tolypocladium,Trametes, or Trichoderma cell.

For example, the filamentous fungal host cell may be an Aspergillusawamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillusjaponicus, Aspergillus nidulans, Aspergillus niger, Aspergillus oryzae,Bjerkandera adusta, Ceriporiopsis aneirina, Ceriporiopsis caregiea,Ceriporiopsis gilvescens, Ceriporiopsis pannocinta, Ceriporiopsisrivulosa, Ceriporiopsis subrufa, Ceriporiopsis subvermispora,Chrysosporium inops, Chrysosporium keratinophilum, Chrysosporiumlucknowense, Chrysosporium merdarium, Chrysosporium pannicola,Chrysosporium queenslandicum, Chrysosporium tropicum, Chrysosporiumzonatum, Coprinus cinereus, Coriolus hirsutus, Fusarium bactridioides,Fusarium cerealis, Fusarium crookwellense, Fusarium culmorum, Fusariumgraminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi,Fusarium oxysporum, Fusarium reticulatum, Fusarium roseum, Fusariumsambucinum, Fusarium sarcochroum, Fusarium sporotrichioides, Fusariumsuiphureum, Fusarium torulosum, Fusarium trichothecioides, Fusariumvenenatum, Humicola insolens, Humicola lanuginosa, Mucor miehei,Myceliophthora thermophila, Neurospora crassa, Penicillium purpurogenum,Phanerochaete chrysosporium, Phiebia radiata, Pleurotus eryngii,Thielavia terrestris, Trametes villosa, Trametes versicolor, Trichodermaharzianum, Trichoderma koningii, Trichoderma longibrachiatum,Trichoderma reesei, or Trichoderma viride cell.

Fungal cells may be transformed by a process involving protoplastformation, transformation of the protoplasts, and regeneration of thecell wall in a manner known per se. Suitable procedures fortransformation of Aspergillus and Trichoderma host cells are describedin EP 238023, Yelton et al., 1984, Proc. Natl. Acad. Sci. USA 81:1470-1474, and Christensen et al., 1988, Bio/Technology 6: 1419-1422.Suitable methods for transforming Fusarium species are described byMalardier et al., 1989, Gene 78: 147-156, and WO 96/00787. Yeast may betransformed using the procedures described by Becker and Guarente, InAbelson, J. N. and Simon, M. I., editors, Guide to Yeast Genetics andMolecular Biology, Methods in Enzymology, Volume 194, pp. 182-187,Academic Press, Inc., New York; Ito et al., 1983, J. Bacteriol. 153:163; and Hinnen et al., 1978, Proc. Natl. Acad. Sci. USA 75: 1920.

Methods of Production

The present invention also relates to methods of producing a polypeptideof the present invention, comprising (a) cultivating a cell, which inits wild-type form produces the polypeptide, under conditions conducivefor production of the polypeptide; and optionally (b) recovering thepolypeptide. In one aspect, the cell is a Talaromyces cell. In anotheraspect, the cell is a Talaromyces leycettanus cell. In another aspect,the cell is Talaromyces leycettanus CBS 398.68.

The present invention also relates to methods of producing a polypeptideof the present invention, comprising (a) cultivating a recombinant hostcell of the present invention under conditions conducive for productionof the polypeptide; and optionally (b) recovering the polypeptide.

The host cells are cultivated in a nutrient medium suitable forproduction of the polypeptide using methods known in the art. Forexample, the cells may be cultivated by shake flask cultivation, orsmall-scale or large-scale fermentation (including continuous, batch,fed-batch, or solid state fermentations) in laboratory or industrialfermentors in a suitable medium and under conditions allowing thepolypeptide to be expressed and/or isolated. The cultivation takes placein a suitable nutrient medium comprising carbon and nitrogen sources andinorganic salts, using procedures known in the art. Suitable media areavailable from commercial suppliers or may be prepared according topublished compositions (e.g., in catalogues of the American Type CultureCollection). If the polypeptide is secreted into the nutrient medium,the polypeptide can be recovered directly from the medium. If thepolypeptide is not secreted, it can be recovered from cell lysates.

The polypeptide may be detected using methods known in the art that arespecific for the polypeptides. These detection methods include, but arenot limited to, use of specific antibodies, formation of an enzymeproduct, or disappearance of an enzyme substrate. For example, an enzymeassay may be used to determine the activity of the polypeptide.

The polypeptide may be recovered using methods known in the art. Forexample, the polypeptide may be recovered from the nutrient medium byconventional procedures including, but not limited to, collection,centrifugation, filtration, extraction, spray-drying, evaporation, orprecipitation. In one aspect, a whole fermentation broth comprising apolypeptide of the present invention is recovered.

The polypeptide may be purified by a variety of procedures known in theart including, but not limited to, chromatography (e.g., ion exchange,affinity, hydrophobic, chromatofocusing, and size exclusion),electrophoretic procedures (e.g., preparative isoelectric focusing),differential solubility (e.g., ammonium sulfate precipitation),SDS-PAGE, or extraction (see, e.g., Protein Purification, Janson andRyden, editors, VCH Publishers, New York, 1989) to obtain substantiallypure polypeptides.

Plants

The present invention also relates to isolated plants, e.g., atransgenic plant, plant part, or plant cell, comprising a polynucleotideof the present invention so as to express and produce a polypeptide ordomain in recoverable quantities. The polypeptide or domain may berecovered from the plant or plant part. Alternatively, the plant orplant part containing the polypeptide or domain may be used as such forimproving the quality of a food or feed, e.g., improving nutritionalvalue, palatability, and rheological properties, or to destroy anantinutritive factor.

The transgenic plant can be dicotyledonous (a dicot) or monocotyledonous(a monocot). Examples of monocot plants are grasses, such as meadowgrass (blue grass, Poa), forage grass such as Festuca, Lolium, temperategrass, such as Agrostis, and cereals, e.g., wheat, oats, rye, barley,rice, sorghum, and maize (corn).

Examples of dicot plants are tobacco, legumes, such as lupins, potato,sugar beet, pea, bean and soybean, and cruciferous plants (familyBrassicaceae), such as cauliflower, rape seed, and the closely relatedmodel organism Arabidopsis thaliana.

Examples of plant parts are stem, callus, leaves, root, fruits, seeds,and tubers as well as the individual tissues comprising these parts,e.g., epidermis, mesophyll, parenchyme, vascular tissues, meristems.Specific plant cell compartments, such as chloroplasts, apoplasts,mitochondria, vacuoles, peroxisomes and cytoplasm are also considered tobe a plant part. Furthermore, any plant cell, whatever the tissueorigin, is considered to be a plant part. Likewise, plant parts such asspecific tissues and cells isolated to facilitate the utilization of theinvention are also considered plant parts, e.g., embryos, endosperms,aleurone and seed coats.

Also included within the scope of the present invention are the progenyof such plants, plant parts, and plant cells.

The transgenic plant or plant cell expressing the polypeptide or domainmay be constructed in accordance with methods known in the art. Inshort, the plant or plant cell is constructed by incorporating one ormore expression constructs encoding the polypeptide or domain into theplant host genome or chloroplast genome and propagating the resultingmodified plant or plant cell into a transgenic plant or plant cell.

The expression construct is conveniently a nucleic acid construct thatcomprises a polynucleotide encoding a polypeptide or domain operablylinked with appropriate regulatory sequences required for expression ofthe polynucleotide in the plant or plant part of choice. Furthermore,the expression construct may comprise a selectable marker useful foridentifying plant cells into which the expression construct has beenintegrated and DNA sequences necessary for introduction of the constructinto the plant in question (the latter depends on the DNA introductionmethod to be used).

The choice of regulatory sequences, such as promoter and terminatorsequences and optionally signal or transit sequences, is determined, forexample, on the basis of when, where, and how the polypeptide or domainis desired to be expressed (Sticklen, 2008, Nature Reviews 9: 433-443).For instance, the expression of the gene encoding a polypeptide ordomain may be constitutive or inducible, or may be developmental, stageor tissue specific, and the gene product may be targeted to a specifictissue or plant part such as seeds or leaves. Regulatory sequences are,for example, described by Tague et al., 1988, Plant Physiology 86: 506.

For constitutive expression, the 35S-CaMV, the maize ubiquitin 1, or therice actin 1 promoter may be used (Franck et al., 1980, Cell 21:285-294; Christensen et al., 1992, Plant Mol. Biol. 18: 675-689; Zhanget al., 1991, Plant Cell 3: 1155-1165). Organ-specific promoters may be,for example, a promoter from storage sink tissues such as seeds, potatotubers, and fruits (Edwards and Coruzzi, 1990, Ann. Rev. Genet. 24:275-303), or from metabolic sink tissues such as meristems (Ito et al.,1994, Plant Mol. Biol. 24: 863-878), a seed specific promoter such asthe glutelin, prolamin, globulin, or albumin promoter from rice (Wu etal., 1998, Plant Cell Physiol. 39: 885-889), a Vicia faba promoter fromthe legumin B4 and the unknown seed protein gene from Vicia faba (Conradet al., 1998, J. Plant Physiol. 152: 708-711), a promoter from a seedoil body protein (Chen et al., 1998, Plant Cell Physiol. 39: 935-941),the storage protein napA promoter from Brassica napus, or any other seedspecific promoter known in the art, e.g., as described in WO 91/14772.Furthermore, the promoter may be a leaf specific promoter such as therbcs promoter from rice or tomato (Kyozuka et al., 1993, Plant Physiol.102: 991-1000), the chlorella virus adenine methyltransferase genepromoter (Mitra and Higgins, 1994, Plant Mol. Biol. 26: 85-93), the aldPgene promoter from rice (Kagaya et al., 1995, Mol. Gen. Genet. 248:668-674), or a wound inducible promoter such as the potato pin2 promoter(Xu et al., 1993, Plant Mol. Biol. 22: 573-588). Likewise, the promotermay be induced by abiotic treatments such as temperature, drought, oralterations in salinity or induced by exogenously applied substancesthat activate the promoter, e.g., ethanol, oestrogens, plant hormonessuch as ethylene, abscisic acid, and gibberellic acid, and heavy metals.

A promoter enhancer element may also be used to achieve higherexpression of a polypeptide or domain in the plant. For instance, thepromoter enhancer element may be an intron that is placed between thepromoter and the polynucleotide encoding a polypeptide or domain. Forinstance, Xu et al., 1993, supra, disclose the use of the first intronof the rice actin 1 gene to enhance expression.

The selectable marker gene and any other parts of the expressionconstruct may be chosen from those available in the art.

The nucleic acid construct is incorporated into the plant genomeaccording to conventional techniques known in the art, includingAgrobacterium-mediated transformation, virus-mediated transformation,microinjection, particle bombardment, biolistic transformation, andelectroporation (Gasser et al., 1990, Science 244: 1293; Potrykus, 1990,Bio/Technology 8: 535; Shimamoto et al., 1989, Nature 338: 274).

Agrobacterium tumefaciens-mediated gene transfer is a method forgenerating transgenic dicots (for a review, see Hooykas andSchilperoort, 1992, Plant Mol. Biol. 19: 15-38) and for transformingmonocots, although other transformation methods may be used for theseplants. A method for generating transgenic monocots is particlebombardment (microscopic gold or tungsten particles coated with thetransforming DNA) of embryonic calli or developing embryos (Christou,1992, Plant J. 2: 275-281; Shimamoto, 1994, Curr. Opin. Biotechnol. 5:158-162; Vasil et al., 1992, Bio/Technology 10: 667-674). An alternativemethod for transformation of monocots is based on protoplasttransformation as described by Omirulleh et al., 1993, Plant Mol. Biol.21: 415-428. Additional transformation methods include those describedin U.S. Pat. Nos. 6,395,966 and 7,151,204 (both of which are hereinincorporated by reference in their entirety).

Following transformation, the transformants having incorporated theexpression construct are selected and regenerated into whole plantsaccording to methods well known in the art. Often the transformationprocedure is designed for the selective elimination of selection geneseither during regeneration or in the following generations by using, forexample, co-transformation with two separate T-DNA constructs or sitespecific excision of the selection gene by a specific recombinase.

In addition to direct transformation of a particular plant genotype witha construct of the present invention, transgenic plants may be made bycrossing a plant having the construct to a second plant lacking theconstruct. For example, a construct encoding a polypeptide or domain canbe introduced into a particular plant variety by crossing, without theneed for ever directly transforming a plant of that given variety.Therefore, the present invention encompasses not only a plant directlyregenerated from cells which have been transformed in accordance withthe present invention, but also the progeny of such plants. As usedherein, progeny may refer to the offspring of any generation of a parentplant prepared in accordance with the present invention. Such progenymay include a DNA construct prepared in accordance with the presentinvention. Crossing results in the introduction of a transgene into aplant line by cross pollinating a starting line with a donor plant line.Non-limiting examples of such steps are described in U.S. Pat. No.7,151,204.

Plants may be generated through a process of backcross conversion. Forexample, plants include plants referred to as a backcross convertedgenotype, line, inbred, or hybrid.

Genetic markers may be used to assist in the introgression of one ormore transgenes of the invention from one genetic background intoanother. Marker assisted selection offers advantages relative toconventional breeding in that it can be used to avoid errors caused byphenotypic variations. Further, genetic markers may provide dataregarding the relative degree of elite germplasm in the individualprogeny of a particular cross. For example, when a plant with a desiredtrait which otherwise has a non-agronomically desirable geneticbackground is crossed to an elite parent, genetic markers may be used toselect progeny which not only possess the trait of interest, but alsohave a relatively large proportion of the desired germplasm. In thisway, the number of generations required to introgress one or more traitsinto a particular genetic background is minimized.

The present invention also relates to methods of producing a polypeptideor domain of the present invention comprising (a) cultivating atransgenic plant or a plant cell comprising a polynucleotide encodingthe polypeptide or domain under conditions conducive for production ofthe polypeptide or domain; and optionally (b) recovering the polypeptideor domain.

Removal or Reduction of Cellulolytic Enhancing Activity

The present invention also relates to methods of producing a mutant of aparent cell, which comprises disrupting or deleting a polynucleotide, ora portion thereof, encoding a polypeptide of the present invention,which results in the mutant cell producing less of the polypeptide thanthe parent cell when cultivated under the same conditions.

The mutant cell may be constructed by reducing or eliminating expressionof the polynucleotide using methods well known in the art, for example,insertions, disruptions, replacements, or deletions. In a preferredaspect, the polynucleotide is inactivated. The polynucleotide to bemodified or inactivated may be, for example, the coding region or a partthereof essential for activity, or a regulatory element required forexpression of the coding region. An example of such a regulatory orcontrol sequence may be a promoter sequence or a functional partthereof, i.e., a part that is sufficient for affecting expression of thepolynucleotide. Other control sequences for possible modificationinclude, but are not limited to, a leader, polyadenylation sequence,propeptide sequence, signal peptide sequence, transcription terminator,and transcriptional activator.

Modification or inactivation of the polynucleotide may be performed bysubjecting the parent cell to mutagenesis and selecting for mutant cellsin which expression of the polynucleotide has been reduced oreliminated. The mutagenesis, which may be specific or random, may beperformed, for example, by use of a suitable physical or chemicalmutagenizing agent, by use of a suitable oligonucleotide, or bysubjecting the DNA sequence to PCR generated mutagenesis. Furthermore,the mutagenesis may be performed by use of any combination of thesemutagenizing agents.

Examples of a physical or chemical mutagenizing agent suitable for thepresent purpose include ultraviolet (UV) irradiation, hydroxylamine,N-methyl-N′-nitro-N-nitrosoguanidine (MNNG), O-methyl hydroxylamine,nitrous acid, ethyl methane sulphonate (EMS), sodium bisulphite, formicacid, and nucleotide analogues.

When such agents are used, the mutagenesis is typically performed byincubating the parent cell to be mutagenized in the presence of themutagenizing agent of choice under suitable conditions, and screeningand/or selecting for mutant cells exhibiting reduced or no expression ofthe gene.

Modification or inactivation of the polynucleotide may also beaccomplished by insertion, substitution, or deletion of one or morenucleotides in the gene or a regulatory element required fortranscription or translation thereof. For example, nucleotides may beinserted or removed so as to result in the introduction of a stop codon,the removal of the start codon, or a change in the open reading frame.Such modification or inactivation may be accomplished by site-directedmutagenesis or PCR generated mutagenesis in accordance with methodsknown in the art. Although, in principle, the modification may beperformed in vivo, i.e., directly on the cell expressing thepolynucleotide to be modified, it is preferred that the modification beperformed in vitro as exemplified below.

An example of a convenient way to eliminate or reduce expression of apolynucleotide is based on techniques of gene replacement, genedeletion, or gene disruption. For example, in the gene disruptionmethod, a nucleic acid sequence corresponding to the endogenouspolynucleotide is mutagenized in vitro to produce a defective nucleicacid sequence that is then transformed into the parent cell to produce adefective gene. By homologous recombination, the defective nucleic acidsequence replaces the endogenous polynucleotide. It may be desirablethat the defective polynucleotide also encodes a marker that may be usedfor selection of transformants in which the polynucleotide has beenmodified or destroyed. In an aspect, the polynucleotide is disruptedwith a selectable marker such as those described herein.

The present invention also relates to methods of inhibiting theexpression of a polypeptide having cellulolytic enhancing activity in acell, comprising administering to the cell or expressing in the cell adouble-stranded RNA (dsRNA) molecule, wherein the dsRNA comprises asubsequence of a polynucleotide of the present invention. In a preferredaspect, the dsRNA is about 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 ormore duplex nucleotides in length.

The dsRNA is preferably a small interfering RNA (siRNA) or a micro RNA(miRNA). In a preferred aspect, the dsRNA is small interfering RNA forinhibiting transcription. In another preferred aspect, the dsRNA ismicro RNA for inhibiting translation.

The present invention also relates to such double-stranded RNA (dsRNA)molecules, comprising a portion of the mature polypeptide codingsequence of SEQ ID NO: 1 or the cDNA sequence thereof or the maturepolypeptide coding sequence of SEQ ID NO: 3 for inhibiting expression ofthe polypeptide in a cell. While the present invention is not limited byany particular mechanism of action, the dsRNA can enter a cell and causethe degradation of a single-stranded RNA (ssRNA) of similar or identicalsequences, including endogenous mRNAs. When a cell is exposed to dsRNA,mRNA from the homologous gene is selectively degraded by a processcalled RNA interference (RNAi).

The dsRNAs of the present invention can be used in gene-silencing. Inone aspect, the invention provides methods to selectively degrade RNAusing a dsRNAi of the present invention. The process may be practiced invitro, ex vivo or in vivo. In one aspect, the dsRNA molecules can beused to generate a loss-of-function mutation in a cell, an organ or ananimal. Methods for making and using dsRNA molecules to selectivelydegrade RNA are well known in the art; see, for example, U.S. Pat. Nos.6,489,127; 6,506,559; 6,511,824; and 6,515,109.

The present invention further relates to a mutant cell of a parent cellthat comprises a disruption or deletion of a polynucleotide encoding thepolypeptide or a control sequence thereof or a silenced gene encodingthe polypeptide, which results in the mutant cell producing less of thepolypeptide or no polypeptide compared to the parent cell.

The polypeptide-deficient mutant cells are particularly useful as hostcells for expression of native and heterologous polypeptides. Therefore,the present invention further relates to methods of producing a nativeor heterologous polypeptide, comprising (a) cultivating the mutant cellunder conditions conducive for production of the polypeptide; and (b)recovering the polypeptide. The term “heterologous polypeptides” meanspolypeptides that are not native to the host cell, e.g., a variant of anative protein. The host cell may comprise more than one copy of apolynucleotide encoding the native or heterologous polypeptide.

The methods used for cultivation and purification of the product ofinterest may be performed by methods known in the art.

The methods of the present invention for producing an essentiallycellulolytic enhancing activity-free product are of particular interestin the production of eukaryotic polypeptides, in particular fungalproteins such as enzymes. The cellulolytic enhancing activity-deficientcells may also be used to express heterologous proteins ofpharmaceutical interest such as hormones, growth factors, receptors, andthe like. The term “eukaryotic polypeptides” includes not only nativepolypeptides, but also those polypeptides, e.g., enzymes, which havebeen modified by amino acid substitutions, deletions or additions, orother such modifications to enhance activity, thermostability, pHtolerance and the like.

In a further aspect, the present invention relates to a protein productessentially free from cellulolytic enhancing activity that is producedby a method of the present invention.

Fermentation Broth Formulations or Cell Compositions

The present invention also relates to a fermentation broth formulationor a cell composition comprising a polypeptide of the present invention.The fermentation broth product further comprises additional ingredientsused in the fermentation process, such as, for example, cells(including, the host cells containing the gene encoding the polypeptideof the present invention which are used to produce the polypeptide),cell debris, biomass, fermentation media and/or fermentation products.In some embodiments, the composition is a cell-killed whole brothcontaining organic acid(s), killed cells and/or cell debris, and culturemedium.

The term “fermentation broth” as used herein refers to a preparationproduced by cellular fermentation that undergoes no or minimal recoveryand/or purification. For example, fermentation broths are produced whenmicrobial cultures are grown to saturation, incubated undercarbon-limiting conditions to allow protein synthesis (e.g., expressionof enzymes by host cells) and secretion into cell culture medium. Thefermentation broth can contain unfractionated or fractionated contentsof the fermentation materials derived at the end of the fermentation.Typically, the fermentation broth is unfractionated and comprises thespent culture medium and cell debris present after the microbial cells(e.g., filamentous fungal cells) are removed, e.g., by centrifugation.In some embodiments, the fermentation broth contains spent cell culturemedium, extracellular enzymes, and viable and/or nonviable microbialcells.

In an embodiment, the fermentation broth formulation and cellcompositions comprise a first organic acid component comprising at leastone 1-5 carbon organic acid and/or a salt thereof and a second organicacid component comprising at least one 6 or more carbon organic acidand/or a salt thereof. In a specific embodiment, the first organic acidcomponent is acetic acid, formic acid, propionic acid, a salt thereof,or a mixture of two or more of the foregoing and the second organic acidcomponent is benzoic acid, cyclohexanecarboxylic acid, 4-methylvalericacid, phenylacetic acid, a salt thereof, or a mixture of two or more ofthe foregoing.

In one aspect, the composition contains an organic acid(s), andoptionally further contains killed cells and/or cell debris. In oneembodiment, the killed cells and/or cell debris are removed from acell-killed whole broth to provide a composition that is free of thesecomponents.

The fermentation broth formulations or cell compositions may furthercomprise a preservative and/or anti-microbial (e.g., bacteriostatic)agent, including, but not limited to, sorbitol, sodium chloride,potassium sorbate, and others known in the art.

The fermentation broth formulations or cell compositions may furthercomprise multiple enzymatic activities, such as one or more (e.g.,several) enzymes selected from the group consisting of a cellulase, ahemicellulase, a cellulose inducible protein, an esterase, an expansin,a laccase, a ligninolytic enzyme, a pectinase, a catalase, a peroxidase,a protease, and a swollenin. The fermentation broth formulations or cellcompositions may also comprise one or more (e.g., several) enzymesselected from the group consisting of a hydrolase, an isomerase, aligase, a lyase, an oxidoreductase, or a transferase, e.g., analpha-galactosidase, alpha-glucosidase, aminopeptidase, amylase,beta-galactosidase, beta-glucosidase, beta-xylosidase, carbohydrase,carboxypeptidase, catalase, cellobiohydrolase, cellulase, chitinase,cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease,endoglucanase, esterase, glucoamylase, invertase, laccase, lipase,mannosidase, mutanase, oxidase, pectinolytic enzyme, peroxidase,phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease,transglutaminase, or xylanase.

The cell-killed whole broth or composition may contain theunfractionated contents of the fermentation materials derived at the endof the fermentation. Typically, the cell-killed whole broth orcomposition contains the spent culture medium and cell debris presentafter the microbial cells (e.g., filamentous fungal cells) are grown tosaturation, incubated under carbon-limiting conditions to allow proteinsynthesis (e.g., expression of cellulase and/or glucosidase enzyme(s)).In some embodiments, the cell-killed whole broth or composition containsthe spent cell culture medium, extracellular enzymes, and killedfilamentous fungal cells. In some embodiments, the microbial cellspresent in the cell-killed whole broth or composition can bepermeabilized and/or lysed using methods known in the art.

A whole broth or cell composition as described herein is typically aliquid, but may contain insoluble components, such as killed cells, celldebris, culture media components, and/or insoluble enzyme(s). In someembodiments, insoluble components may be removed to provide a clarifiedliquid composition.

The whole broth formulations and cell compositions of the presentinvention may be produced by a method described in WO 90/15861 or WO2010/096673.

Examples are given below of preferred uses of the compositions of thepresent invention. The dosage of the composition and other conditionsunder which the composition is used may be determined on the basis ofmethods known in the art.

Enzyme Compositions

The present invention also relates to compositions comprising apolypeptide of the present invention. Preferably, the compositions areenriched in such a polypeptide. The term “enriched” indicates that thecellulolytic enhancing activity of the composition has been increased,e.g., with an enrichment factor of at least 1.1.

The compositions may comprise a polypeptide of the present invention asthe major enzymatic component, e.g., a mono-component composition.Alternatively, the compositions may comprise multiple enzymaticactivities, such as one or more (e.g., several) enzymes selected fromthe group consisting of a cellulase, a hemicellulase, a celluloseinducible protein, an esterase, an expansin, a laccase, a ligninolyticenzyme, a pectinase, a catalase, a peroxidase, a protease, and aswollenin. The compositions may also comprise one or more (e.g.,several) enzymes selected from the group consisting of a hydrolase, anisomerase, a ligase, a lyase, an oxidoreductase, or a transferase, e.g.,an alpha-galactosidase, alpha-glucosidase, aminopeptidase, amylase,beta-galactosidase, beta-glucosidase, beta-xylosidase, carbohydrase,carboxypeptidase, catalase, cellobiohydrolase, cellulase, chitinase,cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease,endoglucanase, esterase, glucoamylase, invertase, laccase, lipase,mannosidase, mutanase, oxidase, pectinolytic enzyme, peroxidase,phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease,transglutaminase, or xylanase. The compositions may be prepared inaccordance with methods known in the art and may be in the form of aliquid or a dry composition. The compositions may be stabilized inaccordance with methods known in the art.

Examples are given below of preferred uses of the compositions of thepresent invention. The dosage of the composition and other conditionsunder which the composition is used may be determined on the basis ofmethods known in the art.

Uses

The present invention is also directed to the following processes forusing the polypeptides having cellulolytic enhancing activity, orcompositions thereof.

The present invention also relates to processes for degrading acellulosic material, comprising: treating the cellulosic material withan enzyme composition in the presence of a polypeptide havingcellulolytic enhancing activity of the present invention. In one aspect,the processes further comprise recovering the degraded or convertedcellulosic material. Soluble products of degradation or conversion ofthe cellulosic material can be separated from insoluble cellulosicmaterial using a method known in the art such as, for example,centrifugation, filtration, or gravity settling.

The present invention also relates to processes of producing afermentation product, comprising: (a) saccharifying a cellulosicmaterial with an enzyme composition in the presence of a polypeptidehaving cellulolytic enhancing activity of the present invention; (b)fermenting the saccharified cellulosic material with one or more (e.g.,several) fermenting microorganisms to produce the fermentation product;and (c) recovering the fermentation product from the fermentation.

The present invention also relates to processes of fermenting acellulosic material, comprising: fermenting the cellulosic material withone or more (e.g., several) fermenting microorganisms, wherein thecellulosic material is saccharified with an enzyme composition in thepresence of a polypeptide having cellulolytic enhancing activity of thepresent invention. In one aspect, the fermenting of the cellulosicmaterial produces a fermentation product. In another aspect, theprocesses further comprise recovering the fermentation product from thefermentation.

The processes of the present invention can be used to saccharify thecellulosic material to fermentable sugars and to convert the fermentablesugars to many useful fermentation products, e.g., fuel (ethanol,n-butanol, isobutanol, biodiesel, jet fuel) and/or platform chemicals(e.g., acids, alcohols, ketones, gases, oils, and the like). Theproduction of a desired fermentation product from the cellulosicmaterial typically involves pretreatment, enzymatic hydrolysis(saccharification), and fermentation.

The processing of the cellulosic material according to the presentinvention can be accomplished using methods conventional in the art.Moreover, the processes of the present invention can be implementedusing any conventional biomass processing apparatus configured tooperate in accordance with the invention.

Hydrolysis (saccharification) and fermentation, separate orsimultaneous, include, but are not limited to, separate hydrolysis andfermentation (SHF); simultaneous saccharification and fermentation(SSF); simultaneous saccharification and co-fermentation (SSCF); hybridhydrolysis and fermentation (HHF); separate hydrolysis andco-fermentation (SHCF); hybrid hydrolysis and co-fermentation (HHCF);and direct microbial conversion (DMC), also sometimes calledconsolidated bioprocessing (CBP). SHF uses separate process steps tofirst enzymatically hydrolyze the cellulosic material to fermentablesugars, e.g., glucose, cellobiose, and pentose monomers, and thenferment the fermentable sugars to ethanol. In SSF, the enzymatichydrolysis of the cellulosic material and the fermentation of sugars toethanol are combined in one step (Philippidis, G. P., 1996, Cellulosebioconversion technology, in Handbook on Bioethanol: Production andUtilization, Wyman, C. E., ed., Taylor & Francis, Washington, D.C.,179-212). SSCF involves the co-fermentation of multiple sugars (Sheehanand Himmel, 1999, Biotechnol. Prog. 15: 817-827). HHF involves aseparate hydrolysis step, and in addition a simultaneoussaccharification and hydrolysis step, which can be carried out in thesame reactor. The steps in an HHF process can be carried out atdifferent temperatures, i.e., high temperature enzymaticsaccharification followed by SSF at a lower temperature that thefermentation strain can tolerate. DMC combines all three processes(enzyme production, hydrolysis, and fermentation) in one or more (e.g.,several) steps where the same organism is used to produce the enzymesfor conversion of the cellulosic material to fermentable sugars and toconvert the fermentable sugars into a final product (Lynd et al., 2002,Microbiol. Mol. Biol. Reviews 66: 506-577). It is understood herein thatany method known in the art comprising pretreatment, enzymatichydrolysis (saccharification), fermentation, or a combination thereof,can be used in the practicing the processes of the present invention.

A conventional apparatus can include a fed-batch stirred reactor, abatch stirred reactor, a continuous flow stirred reactor withultrafiltration, and/or a continuous plug-flow column reactor (deCastilhos Corazza et al., 2003, Acta Scientiarum. Technology 25: 33-38;Gusakov and Sinitsyn, 1985, Enz. Microb. Technol. 7: 346-352), anattrition reactor (Ryu and Lee, 1983, Biotechnol. Bioeng. 25: 53-65).Additional reactor types include fluidized bed, upflow blanket,immobilized, and extruder type reactors for hydrolysis and/orfermentation.

Pretreatment.

In practicing the processes of the present invention, any pretreatmentprocess known in the art can be used to disrupt plant cell wallcomponents of the cellulosic material (Chandra et al., 2007, Adv.Biochem. Engin./Biotechnol. 108: 67-93; Galbe and Zacchi, 2007, Adv.Biochem. Engin./Biotechnol. 108: 41-65; Hendriks and Zeeman, 2009,Bioresource Technology 100: 10-18; Mosier et al., 2005, BioresourceTechnology 96: 673-686; Taherzadeh and Karimi, 2008, Int. J. Mol. Sci.9: 1621-1651; Yang and Wyman, 2008, Biofuels Bioproducts andBiorefining-Biofpr. 2: 26-40).

The cellulosic material can also be subjected to particle sizereduction, sieving, pre-soaking, wetting, washing, and/or conditioningprior to pretreatment using methods known in the art.

Conventional pretreatments include, but are not limited to, steampretreatment (with or without explosion), dilute acid pretreatment, hotwater pretreatment, alkaline pretreatment, lime pretreatment, wetoxidation, wet explosion, ammonia fiber explosion, organosolvpretreatment, and biological pretreatment. Additional pretreatmentsinclude ammonia percolation, ultrasound, electroporation, microwave,supercritical CO₂, supercritical H₂O, ozone, ionic liquid, and gammairradiation pretreatments.

The cellulosic material can be pretreated before hydrolysis and/orfermentation. Pretreatment is preferably performed prior to thehydrolysis. Alternatively, the pretreatment can be carried outsimultaneously with enzyme hydrolysis to release fermentable sugars,such as glucose, xylose, and/or cellobiose. In most cases thepretreatment step itself results in some conversion of biomass tofermentable sugars (even in absence of enzymes).

Steam Pretreatment.

In steam pretreatment, the cellulosic material is heated to disrupt theplant cell wall components, including lignin, hemicellulose, andcellulose to make the cellulose and other fractions, e.g.,hemicellulose, accessible to enzymes. The cellulosic material is passedto or through a reaction vessel where steam is injected to increase thetemperature to the required temperature and pressure and is retainedtherein for the desired reaction time. Steam pretreatment is preferablyperformed at 140-250° C., e.g., 160-200° C. or 170-190° C., where theoptimal temperature range depends on optional addition of a chemicalcatalyst. Residence time for the steam pretreatment is preferably 1-60minutes, e.g., 1-30 minutes, 1-20 minutes, 3-12 minutes, or 4-10minutes, where the optimal residence time depends on the temperature andoptional addition of a chemical catalyst. Steam pretreatment allows forrelatively high solids loadings, so that the cellulosic material isgenerally only moist during the pretreatment. The steam pretreatment isoften combined with an explosive discharge of the material after thepretreatment, which is known as steam explosion, that is, rapid flashingto atmospheric pressure and turbulent flow of the material to increasethe accessible surface area by fragmentation (Duff and Murray, 1996,Bioresource Technology 855: 1-33; Galbe and Zacchi, 2002, Appl.Microbiol. Biotechnol. 59: 618-628; U.S. Patent Application No.2002/0164730). During steam pretreatment, hemicellulose acetyl groupsare cleaved and the resulting acid autocatalyzes partial hydrolysis ofthe hemicellulose to monosaccharides and oligosaccharides. Lignin isremoved to only a limited extent.

Chemical Pretreatment:

The term “chemical treatment” refers to any chemical pretreatment thatpromotes the separation and/or release of cellulose, hemicellulose,and/or lignin. Such a pretreatment can convert crystalline cellulose toamorphous cellulose. Examples of suitable chemical pretreatmentprocesses include, for example, dilute acid pretreatment, limepretreatment, wet oxidation, ammonia fiber/freeze expansion (AFEX),ammonia percolation (APR), ionic liquid, and organosolv pretreatments.

A chemical catalyst such as H₂SO₄ or SO₂ (typically 0.3 to 5% w/w) issometimes added prior to steam pretreatment, which decreases the timeand temperature, increases the recovery, and improves enzymatichydrolysis (Ballesteros et al., 2006, Appl. Biochem. Biotechnol.129-132: 496-508; Varga et al., 2004, Appl. Biochem. Biotechnol.113-116: 509-523; Sassner et al., 2006, Enzyme Microb. Technol. 39:756-762). In dilute acid pretreatment, the cellulosic material is mixedwith dilute acid, typically H₂SO₄, and water to form a slurry, heated bysteam to the desired temperature, and after a residence time flashed toatmospheric pressure. The dilute acid pretreatment can be performed witha number of reactor designs, e.g., plug-flow reactors, counter-currentreactors, or continuous counter-current shrinking bed reactors (Duff andMurray, 1996, Bioresource Technology 855: 1-33; Schell et al., 2004,Bioresource Technology 91: 179-188; Lee et al., 1999, Adv. Biochem. Eng.Biotechnol. 65: 93-115).

Several methods of pretreatment under alkaline conditions can also beused. These alkaline pretreatments include, but are not limited to,sodium hydroxide, lime, wet oxidation, ammonia percolation (APR), andammonia fiber/freeze expansion (AFEX) pretreatment.

Lime pretreatment is performed with calcium oxide or calcium hydroxideat temperatures of 85-150° C. and residence times from 1 hour to severaldays (Wyman et al., 2005, Bioresource Technology 96: 1959-1966; Mosieret al., 2005, Bioresource Technology 96: 673-686). WO 2006/110891, WO2006/110899, WO 2006/110900, and WO 2006/110901 disclose pretreatmentmethods using ammonia.

Wet oxidation is a thermal pretreatment performed typically at 180-200°C. for 5-15 minutes with addition of an oxidative agent such as hydrogenperoxide or over-pressure of oxygen (Schmidt and Thomsen, 1998,Bioresource Technology 64: 139-151; Palonen et al., 2004, Appl. Biochem.Biotechnol. 117: 1-17; Varga et al., 2004, Biotechnol. Bioeng. 88:567-574; Martin et al., 2006, J. Chem. Technol. Biotechnol. 81:1669-1677). The pretreatment is performed preferably at 1-40% drymatter, e.g., 2-30% dry matter or 5-20% dry matter, and often theinitial pH is increased by the addition of alkali such as sodiumcarbonate.

A modification of the wet oxidation pretreatment method, known as wetexplosion (combination of wet oxidation and steam explosion) can handledry matter up to 30%. In wet explosion, the oxidizing agent isintroduced during pretreatment after a certain residence time. Thepretreatment is then ended by flashing to atmospheric pressure (WO2006/032282).

Ammonia fiber expansion (AFEX) involves treating the cellulosic materialwith liquid or gaseous ammonia at moderate temperatures such as 90-150°C. and high pressure such as 17-20 bar for 5-10 minutes, where the drymatter content can be as high as 60% (Gollapalli et al., 2002, Appl.Biochem. Biotechnol. 98: 23-35; Chundawat et al., 2007, Biotechnol.Bioeng. 96: 219-231; Alizadeh et al., 2005, Appl. Biochem. Biotechnol.121: 1133-1141; Teymouri et al., 2005, Bioresource Technology 96:2014-2018). During AFEX pretreatment cellulose and hemicelluloses remainrelatively intact. Lignin-carbohydrate complexes are cleaved.

Organosolv pretreatment delignifies the cellulosic material byextraction using aqueous ethanol (40-60% ethanol) at 160-200° C. for30-60 minutes (Pan et al., 2005, Biotechnol. Bioeng. 90: 473-481; Pan etal., 2006, Biotechnol. Bioeng. 94: 851-861; Kurabi et al., 2005, Appl.Biochem. Biotechnol. 121: 219-230). Sulphuric acid is usually added as acatalyst. In organosolv pretreatment, the majority of hemicellulose andlignin is removed.

Other examples of suitable pretreatment methods are described by Schellet al., 2003, Appl. Biochem. Biotechnol. 105-108: 69-85, and Mosier etal., 2005, Bioresource Technology 96: 673-686, and U.S. PublishedApplication 2002/0164730.

In one aspect, the chemical pretreatment is preferably carried out as adilute acid treatment, and more preferably as a continuous dilute acidtreatment. The acid is typically sulfuric acid, but other acids can alsobe used, such as acetic acid, citric acid, nitric acid, phosphoric acid,tartaric acid, succinic acid, hydrogen chloride, or mixtures thereof.Mild acid treatment is conducted in the pH range of preferably 1-5,e.g., 1-4 or 1-2.5. In one aspect, the acid concentration is in therange from preferably 0.01 to 10 wt. % acid, e.g., 0.05 to 5 wt. % acidor 0.1 to 2 wt. % acid. The acid is contacted with the cellulosicmaterial and held at a temperature in the range of preferably 140-200°C., e.g., 165-190° C., for periods ranging from 1 to 60 minutes.

In another aspect, pretreatment takes place in an aqueous slurry. Inpreferred aspects, the cellulosic material is present duringpretreatment in amounts preferably between 10-80 wt. %, e.g., 20-70 wt.% or 30-60 wt. %, such as around 40 wt. %. The pretreated cellulosicmaterial can be unwashed or washed using any method known in the art,e.g., washed with water.

Mechanical Pretreatment or Physical Pretreatment: The term “mechanicalpretreatment” or “physical pretreatment” refers to any pretreatment thatpromotes size reduction of particles. For example, such pretreatment caninvolve various types of grinding or milling (e.g., dry milling, wetmilling, or vibratory ball milling).

The cellulosic material can be pretreated both physically (mechanically)and chemically. Mechanical or physical pretreatment can be coupled withsteaming/steam explosion, hydrothermolysis, dilute or mild acidtreatment, high temperature, high pressure treatment, irradiation (e.g.,microwave irradiation), or combinations thereof. In one aspect, highpressure means pressure in the range of preferably about 100 to about400 psi, e.g., about 150 to about 250 psi. In another aspect, hightemperature means temperature in the range of about 100 to about 300°C., e.g., about 140 to about 200° C. In a preferred aspect, mechanicalor physical pretreatment is performed in a batch-process using a steamgun hydrolyzer system that uses high pressure and high temperature asdefined above, e.g., a Sunds Hydrolyzer available from Sunds DefibratorAB, Sweden. The physical and chemical pretreatments can be carried outsequentially or simultaneously, as desired.

Accordingly, in a preferred aspect, the cellulosic material is subjectedto physical (mechanical) or chemical pretreatment, or any combinationthereof, to promote the separation and/or release of cellulose,hemicellulose, and/or lignin.

Biological Pretreatment:

The term “biological pretreatment” refers to any biological pretreatmentthat promotes the separation and/or release of cellulose, hemicellulose,and/or lignin from the cellulosic material. Biological pretreatmenttechniques can involve applying lignin-solubilizing microorganismsand/or enzymes (see, for example, Hsu, T.-A., 1996, Pretreatment ofbiomass, in Handbook on Bioethanol: Production and Utilization, Wyman,C. E., ed., Taylor & Francis, Washington, D.C., 179-212; Ghosh andSingh, 1993, Adv. Appl. Microbiol. 39: 295-333; McMillan, J. D., 1994,Pretreating lignocellulosic biomass: a review, in Enzymatic Conversionof Biomass for Fuels Production, Himmel, M. E., Baker, J. O., andOverend, R. P., eds., ACS Symposium Series 566, American ChemicalSociety, Washington, D.C., chapter 15; Gong, C. S., Cao, N. J., Du, J.,and Tsao, G. T., 1999, Ethanol production from renewable resources, inAdvances in Biochemical Engineering/Biotechnology, Scheper, T., ed.,Springer-Verlag Berlin Heidelberg, Germany, 65: 207-241; Olsson andHahn-Hagerdal, 1996, Enz. Microb. Tech. 18: 312-331; and Vallander andEriksson, 1990, Adv. Biochem. Eng./Biotechnol. 42: 63-95).

Saccharification.

In the hydrolysis step, also known as saccharification, the cellulosicmaterial, e.g., pretreated, is hydrolyzed to break down cellulose and/orhemicellulose to fermentable sugars, such as glucose, cellobiose,xylose, xylulose, arabinose, mannose, galactose, and/or solubleoligosaccharides. The hydrolysis is performed enzymatically by an enzymecomposition as described herein in the presence of a polypeptide havingcellulolytic enhancing activity of the present invention. The enzymes ofthe compositions can be added simultaneously or sequentially.

Enzymatic hydrolysis is preferably carried out in a suitable aqueousenvironment under conditions that can be readily determined by oneskilled in the art. In one aspect, hydrolysis is performed underconditions suitable for the activity of the enzyme(s), i.e., optimal forthe enzyme(s). The hydrolysis can be carried out as a fed batch orcontinuous process where the cellulosic material is fed gradually to,for example, an enzyme containing hydrolysis solution.

The saccharification is generally performed in stirred-tank reactors orfermentors under controlled pH, temperature, and mixing conditions.Suitable process time, temperature and pH conditions can readily bedetermined by one skilled in the art. For example, the saccharificationcan last up to 200 hours, but is typically performed for preferablyabout 12 to about 120 hours, e.g., about 16 to about 72 hours or about24 to about 48 hours. The temperature is in the range of preferablyabout 25° C. to about 70° C., e.g., about 30° C. to about 65° C., about40° C. to about 60° C., or about 50° C. to about 55° C. The pH is in therange of preferably about 3 to about 8, e.g., about 3.5 to about 7,about 4 to about 6, or about 4.5 to about 5.5. The dry solids content isin the range of preferably about 5 to about 50 wt. %, e.g., about 10 toabout 40 wt. % or about 20 to about 30 wt. %.

The enzyme compositions can comprise any protein useful in degrading thecellulosic material.

In one aspect, the enzyme composition comprises or further comprises oneor more (e.g., several) proteins selected from the group consisting of acellulase, a hemicellulase, a cellulose inducible protein, an esterase,an expansin, a laccase, a ligninolytic enzyme, a pectinase, a catalase,a peroxidase, a protease, and a swollenin. In another aspect, thecellulase is preferably one or more (e.g., several) enzymes selectedfrom the group consisting of an endoglucanase, a cellobiohydrolase, anda beta-glucosidase. In another aspect, the hemicellulase is preferablyone or more (e.g., several) enzymes selected from the group consistingof an acetylmannan esterase, an acetylxylan esterase, an arabinanase, anarabinofuranosidase, a coumaric acid esterase, a feruloyl esterase, agalactosidase, a glucuronidase, a glucuronoyl esterase, a mannanase, amannosidase, a xylanase, and a xylosidase.

In another aspect, the enzyme composition comprises one or more (e.g.,several) cellulolytic enzymes. In another aspect, the enzyme compositioncomprises or further comprises one or more (e.g., several)hemicellulolytic enzymes. In another aspect, the enzyme compositioncomprises one or more (e.g., several) cellulolytic enzymes and one ormore (e.g., several) hemicellulolytic enzymes. In another aspect, theenzyme composition comprises one or more (e.g., several) enzymesselected from the group of cellulolytic enzymes and hemicellulolyticenzymes. In another aspect, the enzyme composition comprises anendoglucanase. In another aspect, the enzyme composition comprises acellobiohydrolase. In another aspect, the enzyme composition comprises acellobiohydrolase I, a cellobiohydrolase II, or a combination of acellobiohydrolase I and a cellobiohydrolase II. In another aspect, theenzyme composition comprises a beta-glucosidase. In another aspect, theenzyme composition comprises an endoglucanase and a cellobiohydrolase.In another aspect, the enzyme composition comprises an endoglucanase anda cellobiohydrolase I, a cellobiohydrolase II, or a combination of acellobiohydrolase I and a cellobiohydrolase II. In another aspect, theenzyme composition comprises an endoglucanase and a beta-glucosidase. Inanother aspect, the enzyme composition comprises a beta-glucosidase anda cellobiohydrolase. In another aspect, the enzyme composition comprisesa beta-glucosidase and a cellobiohydrolase I, a cellobiohydrolase II, ora combination of a cellobiohydrolase I and a cellobiohydrolase II. Inanother aspect, the enzyme composition comprises an endoglucanase, abeta-glucosidase, and a cellobiohydrolase. In another aspect, the enzymecomposition comprises an endoglucanase, a beta-glucosidase, and acellobiohydrolase I, a cellobiohydrolase II, or a combination of acellobiohydrolase I and a cellobiohydrolase II.

In another aspect, the enzyme composition comprises an acetylmannanesterase. In another aspect, the enzyme composition comprises anacetylxylan esterase. In another aspect, the enzyme compositioncomprises an arabinanase (e.g., alpha-L-arabinanase). In another aspect,the enzyme composition comprises an arabinofuranosidase (e.g.,alpha-L-arabinofuranosidase). In another aspect, the enzyme compositioncomprises a coumaric acid esterase. In another aspect, the enzymecomposition comprises a feruloyl esterase. In another aspect, the enzymecomposition comprises a galactosidase (e.g., alpha-galactosidase and/orbeta-galactosidase). In another aspect, the enzyme composition comprisesa glucuronidase (e.g., alpha-D-glucuronidase). In another aspect, theenzyme composition comprises a glucuronoyl esterase. In another aspect,the enzyme composition comprises a mannanase. In another aspect, theenzyme composition comprises a mannosidase (e.g., beta-mannosidase). Inanother aspect, the enzyme composition comprises a xylanase. In anembodiment, the xylanase is a Family 10 xylanase. In another embodiment,the xylanase is a Family 11 xylanase. In another aspect, the enzymecomposition comprises a xylosidase (e.g., beta-xylosidase).

In another aspect, the enzyme composition comprises an esterase. Inanother aspect, the enzyme composition comprises an expansin. In anotheraspect, the enzyme composition comprises a laccase. In another aspect,the enzyme composition comprises a ligninolytic enzyme. In a preferredaspect, the ligninolytic enzyme is a manganese peroxidase. In anotherpreferred aspect, the ligninolytic enzyme is a lignin peroxidase. Inanother preferred aspect, the ligninolytic enzyme is a H₂O₂-producingenzyme. In another aspect, the enzyme composition comprises a pectinase.In another aspect, the enzyme composition comprises a catalase. Inanother aspect, the enzyme composition comprises a peroxidase. Inanother aspect, the enzyme composition comprises a protease. In anotheraspect, the enzyme composition comprises a swollenin.

In the processes of the present invention, the enzyme(s) can be addedprior to or during saccharification, saccharification and fermentation,or fermentation.

One or more (e.g., several) components of the enzyme composition may benative proteins, recombinant proteins, or a combination of nativeproteins and recombinant proteins. For example, one or more (e.g.,several) components may be native proteins of a cell, which is used as ahost cell to express recombinantly one or more (e.g., several) othercomponents of the enzyme composition. It is understood herein that therecombinant proteins may be heterologous (e.g., foreign) and/or nativeto the host cell. One or more (e.g., several) components of the enzymecomposition may be produced as monocomponents, which are then combinedto form the enzyme composition. The enzyme composition may be acombination of multicomponent and monocomponent protein preparations.

The enzymes used in the processes of the present invention may be in anyform suitable for use, such as, for example, a fermentation brothformulation or a cell composition, a cell lysate with or withoutcellular debris, a semi-purified or purified enzyme preparation, or ahost cell as a source of the enzymes. The enzyme composition may be adry powder or granulate, a non-dusting granulate, a liquid, a stabilizedliquid, or a stabilized protected enzyme. Liquid enzyme preparationsmay, for instance, be stabilized by adding stabilizers such as a sugar,a sugar alcohol or another polyol, and/or lactic acid or another organicacid according to established processes.

The optimum amounts of the enzymes and a polypeptide having cellulolyticenhancing activity depend on several factors including, but not limitedto, the mixture of cellulolytic enzymes and/or hemicellulolytic enzymes,the cellulosic material, the concentration of cellulosic material, thepretreatment(s) of the cellulosic material, temperature, time, pH, andinclusion of a fermenting organism (e.g., for SimultaneousSaccharification and Fermentation).

In one aspect, an effective amount of cellulolytic or hemicellulolyticenzyme to the cellulosic material is about 0.5 to about 50 mg, e.g.,about 0.5 to about 40 mg, about 0.5 to about 25 mg, about 0.75 to about20 mg, about 0.75 to about 15 mg, about 0.5 to about 10 mg, or about 2.5to about 10 mg per g of the cellulosic material.

In another aspect, an effective amount of a polypeptide havingcellulolytic enhancing activity to the cellulosic material is about 0.01to about 50.0 mg, e.g., about 0.01 to about 40 mg, about 0.01 to about30 mg, about 0.01 to about 20 mg, about 0.01 to about 10 mg, about 0.01to about 5 mg, about 0.025 to about 1.5 mg, about 0.05 to about 1.25 mg,about 0.075 to about 1.25 mg, about 0.1 to about 1.25 mg, about 0.15 toabout 1.25 mg, or about 0.25 to about 1.0 mg per g of the cellulosicmaterial.

In another aspect, an effective amount of a polypeptide havingcellulolytic enhancing activity to cellulolytic or hemicellulolyticenzyme is about 0.005 to about 1.0 g, e.g., about 0.01 to about 1.0 g,about 0.15 to about 0.75 g, about 0.15 to about 0.5 g, about 0.1 toabout 0.5 g, about 0.1 to about 0.25 g, or about 0.05 to about 0.2 g perg of cellulolytic or hemicellulolytic enzyme.

The polypeptides having cellulolytic enzyme activity or hemicellulolyticenzyme activity as well as other proteins/polypeptides useful in thedegradation of the cellulosic material (collectively hereinafter“polypeptides having enzyme activity”) can be derived or obtained fromany suitable origin, including, archaeal, bacterial, fungal, yeast,plant, or animal origin. The term “obtained” also means herein that theenzyme may have been produced recombinantly in a host organism employingmethods described herein, wherein the recombinantly produced enzyme iseither native or foreign to the host organism or has a modified aminoacid sequence, e.g., having one or more (e.g., several) amino acids thatare deleted, inserted and/or substituted, i.e., a recombinantly producedenzyme that is a mutant and/or a fragment of a native amino acidsequence or an enzyme produced by nucleic acid shuffling processes knownin the art. Encompassed within the meaning of a native enzyme arenatural variants and within the meaning of a foreign enzyme are variantsobtained by, e.g., site-directed mutagenesis or shuffling.

A polypeptide having enzyme activity may be a bacterial polypeptide. Forexample, the polypeptide may be a Gram positive bacterial polypeptidesuch as a Bacillus, Streptococcus, Streptomyces, Staphylococcus,Enterococcus, Lactobacillus, Lactococcus, Clostridium, Geobacillus,Caldicellulosiruptor, Acidothermus, Thermobifidia, or Oceanobacilluspolypeptide having enzyme activity, or a Gram negative bacterialpolypeptide such as an E. coli, Pseudomonas, Salmonella, Campylobacter,Helicobacter, Flavobacterium, Fusobacterium, Ilyobacter, Neisseria, orUreaplasma polypeptide having enzyme activity.

In one aspect, the polypeptide is a Bacillus alkalophilus, Bacillusamyloliquefaciens, Bacillus brevis, Bacillus circulans, Bacillusclausii, Bacillus coagulans, Bacillus firmus, Bacillus lautus, Bacilluslentus, Bacillus licheniformis, Bacillus megaterium, Bacillus pumilus,Bacillus stearothermophilus, Bacillus subtilis, or Bacillusthuringiensis polypeptide having enzyme activity.

In another aspect, the polypeptide is a Streptococcus equisimilis,Streptococcus pyogenes, Streptococcus uberis, or Streptococcus equisubsp. Zooepidemicus polypeptide having enzyme activity.

In another aspect, the polypeptide is a Streptomyces achromogenes,Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus,or Streptomyces lividans polypeptide having enzyme activity.

The polypeptide having enzyme activity may also be a fungal polypeptide,and more preferably a yeast polypeptide such as a Candida,Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces, or Yarrowiapolypeptide having enzyme activity; or more preferably a filamentousfungal polypeptide such as an Acremonium, Agaricus, Alternaria,Aspergillus, Aureobasidium, Botryosphaeria, Ceriporiopsis, Chaetomidium,Chrysosporium, Claviceps, Cochliobolus, Coprinopsis, Coptotermes,Corynascus, Cryphonectria, Cryptococcus, Diplodia, Exidia, Filibasidium,Fusarium, Gibberella, Holomastigotoides, Humicola, Irpex, Lentinula,Leptospaeria, Magnaporthe, Melanocarpus, Meripilus, Mucor,Myceliophthora, Neocallimastix, Neurospora, Paecilomyces, Penicillium,Phanerochaete, Piromyces, Poitrasia, Pseudoplectania,Pseudotrichonympha, Rhizomucor, Schizophyllum, Scytalidium, Talaromyces,Thermoascus, Thielavia, Tolypocladium, Trichoderma, Trichophaea,Verticillium, Volvariella, or Xylaria polypeptide having enzymeactivity.

In one aspect, the polypeptide is a Saccharomyces carlsbergensis,Saccharomyces cerevisiae, Saccharomyces diastaticus, Saccharomycesdouglasii, Saccharomyces kluyveri, Saccharomyces norbensis, orSaccharomyces oviformis polypeptide having enzyme activity.

In another aspect, the polypeptide is an Acremonium cellulolyticus,Aspergillus aculeatus, Aspergillus awamori, Aspergillus fumigatus,Aspergillus foetidus, Aspergillus japonicus, Aspergillus nidulans,Aspergillus niger, Aspergillus oryzae, Chrysosporium keratinophilum,Chrysosporium lucknowense, Chrysosporium tropicum, Chrysosporiummerdarium, Chrysosporium inops, Chrysosporium pannicola, Chrysosporiumqueenslandicum, Chrysosporium zonatum, Fusarium bactridioides, Fusariumcerealis, Fusarium crookwellense, Fusarium culmorum, Fusariumgraminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi,Fusarium oxysporum, Fusarium reticulatum, Fusarium roseum, Fusariumsambucinum, Fusarium sarcochroum, Fusarium sporotrichioides, Fusariumsuiphureum, Fusarium torulosum, Fusarium trichothecioides, Fusariumvenenatum, Humicola grisea, Humicola insolens, Humicola lanuginosa,Irpex lacteus, Mucor miehei, Myceliophthora thermophila, Neurosporacrassa, Penicillium funiculosum, Penicillium purpurogenum, Phanerochaetechrysosporium, Thielavia achromatica, Thielavia albomyces, Thielaviaalbopilosa, Thielavia australeinsis, Thielavia fimeti, Thielaviamicrospora, Thielavia ovispora, Thielavia peruviana, Thielaviaspededonium, Thielavia setosa, Thielavia subthermophila, Thielaviaterrestris, Trichoderma harzianum, Trichoderma koningii, Trichodermalongibrachiatum, Trichoderma reesei, Trichoderma viride, or Trichophaeasaccata polypeptide having enzyme activity.

Chemically modified or protein engineered mutants of polypeptides havingenzyme activity may also be used.

One or more (e.g., several) components of the enzyme composition may bea recombinant component, i.e., produced by cloning of a DNA sequenceencoding the single component and subsequent cell transformed with theDNA sequence and expressed in a host (see, for example, WO 91/17243 andWO 91/17244). The host can be a heterologous host (enzyme is foreign tohost), but the host may under certain conditions also be a homologoushost (enzyme is native to host). Monocomponent cellulolytic proteins mayalso be prepared by purifying such a protein from a fermentation broth.

In one aspect, the one or more (e.g., several) cellulolytic enzymescomprise a commercial cellulolytic enzyme preparation. Examples ofcommercial cellulolytic enzyme preparations suitable for use in thepresent invention include, for example, CELLIC® CTec (Novozymes A/S),CELLIC® CTec2 (Novozymes A/S), CELLIC® CTec3 (Novozymes A/S),CELLUCLAST™ (Novozymes A/S), NOVOZYM™ 188 (Novozymes A/S), SPEZYME™ CP(Genencor Int.), ACCELLERASE™ TRIO (DuPont), FILTRASE® NL (DSM);METHAPLUS® S/L 100 (DSM), ROHAMENT™ 7069 W (Röhm GmbH), or ALTERNAFUEL®CMAX3™ (Dyadic International, Inc.). The cellulolytic enzyme preparationis added in an amount effective from about 0.001 to about 5.0 wt. % ofsolids, e.g., about 0.025 to about 4.0 wt. % of solids or about 0.005 toabout 2.0 wt. % of solids.

Examples of bacterial endoglucanases that can be used in the processesof the present invention, include, but are not limited to, Acidothermuscellulolyticus endoglucanase (WO 91/05039; WO 93/15186; U.S. Pat. No.5,275,944; WO 96/02551; U.S. Pat. No. 5,536,655; WO 00/70031; WO05/093050), Erwinia carotovara endoglucanase (Saarilahti et al., 1990,Gene 90: 9-14), Thermobifida fusca endoglucanase III (WO 05/093050), andThermobifida fusca endoglucanase V (WO 05/093050).

Examples of fungal endoglucanases that can be used in the presentinvention, include, but are not limited to, Trichoderma reeseiendoglucanase I (Penttila et al., 1986, Gene 45: 253-263, Trichodermareesei Cel7B endoglucanase I (GenBank:M15665), Trichoderma reeseiendoglucanase II (Saloheimo et al., 1988, Gene 63:11-22), Trichodermareesei Cel5A endoglucanase II (GenBank:M19373), Trichoderma reeseiendoglucanase III (Okada et al., 1988, Appl. Environ. Microbiol. 64:555-563, GenBank:AB003694), Trichoderma reesei endoglucanase V(Saloheimo et al., 1994, Molecular Microbiology 13: 219-228,GenBank:Z33381), Aspergillus aculeatus endoglucanase (Ooi et al., 1990,Nucleic Acids Research 18: 5884), Aspergillus kawachii endoglucanase(Sakamoto et al., 1995, Current Genetics 27: 435-439), Fusariumoxysporum endoglucanase (GenBank:L29381), Humicola grisea var.thermoidea endoglucanase (GenBank:AB003107), Melanocarpus albomycesendoglucanase (GenBank:MAL515703), Neurospora crassa endoglucanase(GenBank:XM_324477), Humicola insolens endoglucanase V, Myceliophthorathermophila CBS 117.65 endoglucanase, basidiomycete CBS 495.95endoglucanase, basidiomycete CBS 494.95 endoglucanase, Thielaviaterrestris NRRL 8126 CEL6B endoglucanase, Thielavia terrestris NRRL 8126CEL6C endoglucanase, Thielavia terrestris NRRL 8126 CEL7C endoglucanase,Thielavia terrestris NRRL 8126 CEL7E endoglucanase, Thielavia terrestrisNRRL 8126 CEL7F endoglucanase, Cladorrhinum foecundissimum ATCC 62373CEL7A endoglucanase, Thermoascus aurantiacus endoglucanase I(GenBank:AF487830), and Trichoderma reesei strain No. VTT-D-80133endoglucanase (GenBank:M15665).

Examples of cellobiohydrolases useful in the present invention include,but are not limited to, Aspergillus aculeatus cellobiohydrolase II (WO2011/059740), Chaetomium thermophilum cellobiohydrolase I, Chaetomiumthermophilum cellobiohydrolase II, Humicola insolens cellobiohydrolaseI, Myceliophthora thermophila cellobiohydrolase II (WO 2009/042871),Penicillium occitanis cellobiohydrolase I (GenBank:AY690482),Talaromyces emersonii cellobiohydrolase I (GenBank:AF439936), Thielaviahyrcanie cellobiohydrolase II (WO 2010/141325), Thielavia terrestriscellobiohydrolase II (CEL6A, WO 2006/074435), Trichoderma reeseicellobiohydrolase I, Trichoderma reesei cellobiohydrolase II, andTrichophaea saccata cellobiohydrolase II (WO 2010/057086).

Examples of beta-glucosidases useful in the present invention include,but are not limited to, beta-glucosidases from Aspergillus aculeatus(Kawaguchi et al., 1996, Gene 173: 287-288), Aspergillus fumigatus (WO2005/047499), Aspergillus niger (Dan et al., 2000, J. Biol. Chem. 275:4973-4980), Aspergillus oryzae (WO 02/095014), Penicillium brasilianumIBT 20888 (WO 2007/019442 and WO 2010/088387), Thielavia terrestris (WO2011/035029), and Trichophaea saccata (WO 2007/019442).

The beta-glucosidase may be a fusion protein. In one aspect, thebeta-glucosidase is an Aspergillus oryzae beta-glucosidase variant BGfusion protein (WO 2008/057637) or an Aspergillus oryzaebeta-glucosidase fusion protein (WO 2008/057637).

Other useful endoglucanases, cellobiohydrolases, and beta-glucosidasesare disclosed in numerous Glycosyl Hydrolase families using theclassification according to Henrissat, 1991, Biochem. J. 280: 309-316,and Henrissat and Bairoch, 1996, Biochem. J. 316: 695-696.

Other cellulolytic enzymes that may be used in the present invention aredescribed in WO 98/13465, WO 98/015619, WO 98/015633, WO 99/06574, WO99/10481, WO 99/025847, WO 99/031255, WO 2002/101078, WO 2003/027306, WO2003/052054, WO 2003/052055, WO 2003/052056, WO 2003/052057, WO2003/052118, WO 2004/016760, WO 2004/043980, WO 2004/048592, WO2005/001065, WO 2005/028636, WO 2005/093050, WO 2005/093073, WO2006/074005, WO 2006/117432, WO 2007/071818, WO 2007/071820, WO2008/008070, WO 2008/008793, U.S. Pat. No. 5,457,046, U.S. Pat. No.5,648,263, and U.S. Pat. No. 5,686,593.

In one aspect, the polypeptide having cellulolytic enhancing activity isused in the presence of a soluble activating divalent metal cationaccording to WO 2008/151043, e.g., manganese or copper.

In another aspect, the polypeptide having cellulolytic enhancingactivity is used in the presence of a dioxy compound, a bicycliccompound, a heterocyclic compound, a nitrogen-containing compound, aquinone compound, a sulfur-containing compound, or a liquor obtainedfrom a pretreated cellulosic material such as pretreated corn stover (WO2012/021394, WO 2012/021395, WO 2012/021396, WO 2012/021399, WO2012/021400, WO 2012/021401, WO 2012/021408, and WO 2012/021410).

The dioxy compound may include any suitable compound containing two ormore oxygen atoms. In some aspects, the dioxy compounds contain asubstituted aryl moiety as described herein. The dioxy compounds maycomprise one or more (e.g., several) hydroxyl and/or hydroxylderivatives, but also include substituted aryl moieties lacking hydroxyland hydroxyl derivatives. Non-limiting examples of the dioxy compoundsinclude pyrocatechol or catechol; caffeic acid; 3,4-dihydroxybenzoicacid; 4-tert-butyl-5-methoxy-1,2-benzenediol; pyrogallol; gallic acid;methyl-3,4,5-trihydroxybenzoate; 2,3,4-trihydroxybenzophenone;2,6-dimethoxyphenol; sinapinic acid; 3,5-dihydroxybenzoic acid;4-chloro-1,2-benzenediol; 4-nitro-1,2-benzenediol; tannic acid; ethylgallate; methyl glycolate; dihydroxyfumaric acid; 2-butyne-1,4-diol;(croconic acid; 1,3-propanediol; tartaric acid; 2,4-pentanediol;3-ethyoxy-1,2-propanediol; 2,4,4′-trihydroxybenzophenone;cis-2-butene-1,4-diol; 3,4-dihydroxy-3-cyclobutene-1,2-dione;dihydroxyacetone; acrolein acetal; methyl-4-hydroxybenzoate;4-hydroxybenzoic acid; and methyl-3,5-dimethoxy-4-hydroxybenzoate; or asalt or solvate thereof.

The bicyclic compound may include any suitable substituted fused ringsystem as described herein. The compounds may comprise one or more(e.g., several) additional rings, and are not limited to a specificnumber of rings unless otherwise stated. In one aspect, the bicycliccompound is a flavonoid. In another aspect, the bicyclic compound is anoptionally substituted isoflavonoid. In another aspect, the bicycliccompound is an optionally substituted flavylium ion, such as anoptionally substituted anthocyanidin or optionally substitutedanthocyanin, or derivative thereof. Non-limiting examples of thebicyclic compounds include epicatechin; quercetin; myricetin; taxifolin;kaempferol; morin; acacetin; naringenin; isorhamnetin; apigenin;cyanidin; cyanin; kuromanin; keracyanin; or a salt or solvate thereof.

The heterocyclic compound may be any suitable compound, such as anoptionally substituted aromatic or non-aromatic ring comprising aheteroatom, as described herein. In one aspect, the heterocyclic is acompound comprising an optionally substituted heterocycloalkyl moiety oran optionally substituted heteroaryl moiety. In another aspect, theoptionally substituted heterocycloalkyl moiety or optionally substitutedheteroaryl moiety is an optionally substituted 5-memberedheterocycloalkyl or an optionally substituted 5-membered heteroarylmoiety. In another aspect, the optionally substituted heterocycloalkylor optionally substituted heteroaryl moiety is an optionally substitutedmoiety selected from pyrazolyl, furanyl, imidazolyl, isoxazolyl,oxadiazolyl, oxazolyl, pyrrolyl, pyridyl, pyrimidyl, pyridazinyl,thiazolyl, triazolyl, thienyl, dihydrothieno-pyrazolyl, thianaphthenyl,carbazolyl, benzimidazolyl, benzothienyl, benzofuranyl, indolyl,quinolinyl, benzotriazolyl, benzothiazolyl, benzooxazolyl,benzimidazolyl, isoquinolinyl, isoindolyl, acridinyl, benzoisazolyl,dimethylhydantoin, pyrazinyl, tetrahydrofuranyl, pyrrolinyl,pyrrolidinyl, morpholinyl, indolyl, diazepinyl, azepinyl, thiepinyl,piperidinyl, and oxepinyl. In another aspect, the optionally substitutedheterocycloalkyl moiety or optionally substituted heteroaryl moiety isan optionally substituted furanyl. Non-limiting examples of theheterocyclic compounds include(1,2-dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one;4-hydroxy-5-methyl-3-furanone; 5-hydroxy-2(5H)-furanone;[1,2-dihydroxyethyl]furan-2,3,4(5H)-trione; α-hydroxy-γ-butyrolactone;ribonic γ-lactone; aldohexuronicaldohexuronic acid γ-lactone; gluconicacid δ-lactone; 4-hydroxycoumarin; dihydrobenzofuran;5-(hydroxymethyl)furfural; furoin; 2(5H)-furanone;5,6-dihydro-2H-pyran-2-one; and5,6-dihydro-4-hydroxy-6-methyl-2H-pyran-2-one; or a salt or solvatethereof.

The nitrogen-containing compound may be any suitable compound with oneor more nitrogen atoms. In one aspect, the nitrogen-containing compoundcomprises an amine, imine, hydroxylamine, or nitroxide moiety.Non-limiting examples of the nitrogen-containing compounds includeacetone oxime; violuric acid; pyridine-2-aldoxime; 2-aminophenol;1,2-benzenediamine; 2,2,6,6-tetramethyl-1-piperidinyloxy;5,6,7,8-tetrahydrobiopterin; 6,7-dimethyl-5,6,7,8-tetrahydropterine; andmaleamic acid; or a salt or solvate thereof.

The quinone compound may be any suitable compound comprising a quinonemoiety as described herein. Non-limiting examples of the quinonecompounds include 1,4-benzoquinone; 1,4-naphthoquinone;2-hydroxy-1,4-naphthoquinone; 2,3-dimethoxy-5-methyl-1,4-benzoquinone orcoenzyme Q₀; 2,3,5,6-tetramethyl-1,4-benzoquinone or duroquinone;1,4-dihydroxyanthraquinone; 3-hydroxy-1-methyl-5,6-indolinedione oradrenochrome; 4-tert-butyl-5-methoxy-1,2-benzoquinone; pyrroloquinolinequinone; or a salt or solvate thereof.

The sulfur-containing compound may be any suitable compound comprisingone or more sulfur atoms. In one aspect, the sulfur-containing comprisesa moiety selected from thionyl, thioether, sulfinyl, sulfonyl,sulfamide, sulfonamide, sulfonic acid, and sulfonic ester. Non-limitingexamples of the sulfur-containing compounds include ethanethiol;2-propanethiol; 2-propene-1-thiol; 2-mercaptoethanesulfonic acid;benzenethiol; benzene-1,2-dithiol; cysteine; methionine; glutathione;cystine; or a salt or solvate thereof.

In one aspect, an effective amount of such a compound described above tocellulosic material as a molar ratio of the compound to glucosyl unitsof cellulose is about 10⁻⁶ to about 10, e.g., about 10⁻⁶ to about 7.5,about 10⁻⁶ to about 5, about 10⁻⁶ to about 2.5, about 10⁻⁶ to about 1,about 10⁻⁵ to about 1, about 10⁻⁵ to about 10⁻¹, about 10⁻⁴ to about10⁻¹, about 10⁻³ to about 10⁻¹, or about 10⁻³ to about 10⁻². In anotheraspect, an effective amount of such a compound is about 0.1 μM to about1 M, e.g., about 0.5 μM to about 0.75 M, about 0.75 μM to about 0.5 M,about 1 μM to about 0.25 M, about 1 μM to about 0.1 M, about 5 μM toabout 50 mM, about 10 μM to about 25 mM, about 50 μM to about 25 mM,about 10 μM to about 10 mM, about 5 μM to about 5 mM, or about 0.1 mM toabout 1 mM.

The term “liquor” means the solution phase, either aqueous, organic, ora combination thereof, arising from treatment of a lignocellulose and/orhemicellulose material in a slurry, or monosaccharides thereof, e.g.,xylose, arabinose, mannose, etc., under conditions as described in WO2012/021401, and the soluble contents thereof. A liquor for cellulolyticenhancement of a GH61 polypeptide can be produced by treating alignocellulose or hemicellulose material (or feedstock) by applying heatand/or pressure, optionally in the presence of a catalyst, e.g., acid,optionally in the presence of an organic solvent, and optionally incombination with physical disruption of the material, and thenseparating the solution from the residual solids. Such conditionsdetermine the degree of cellulolytic enhancement obtainable through thecombination of liquor and a GH61 polypeptide during hydrolysis of acellulosic substrate by a cellulolytic enzyme preparation. The liquorcan be separated from the treated material using a method standard inthe art, such as filtration, sedimentation, or centrifugation.

In one aspect, an effective amount of the liquor to cellulose is about10⁻⁶ to about 10 g per g of cellulose, e.g., about 10⁻⁶ to about 7.5 g,about 10⁻⁶ to about 5 g, about 10⁻⁶ to about 2.5 g, about 10⁻⁶ to about1 g, about 10⁻⁵ to about 1 g, about 10⁻⁵ to about 10⁻¹ g, about 10⁻⁴ toabout 10⁻¹ g, about 10⁻³ to about 10⁻¹ g, or about 10⁻³ to about 10⁻² gper g of cellulose.

In one aspect, the one or more (e.g., several) hemicellulolytic enzymescomprise a commercial hemicellulolytic enzyme preparation. Examples ofcommercial hemicellulolytic enzyme preparations suitable for use in thepresent invention include, for example, SHEARZYME™ (Novozymes A/S),CELLIC® HTec (Novozymes A/S), CELLIC® HTec2 (Novozymes A/S), CELLIC®HTec3 (Novozymes A/S), VISCOZYME® (Novozymes A/S), ULTRAFLO® (NovozymesA/S), PULPZYME® HC (Novozymes A/S), MULTIFECT® Xylanase (Genencor),ACCELLERASE® XY (Genencor), ACCELLERASE® XC (Genencor), ECOPULP® TX-200A(AB Enzymes), HSP 6000 Xylanase (DSM), DEPOL™ 333P (Biocatalysts Limit,Wales, UK), DEPOL™ 740L. (Biocatalysts Limit, Wales, UK), and DEPOL™762P (Biocatalysts Limit, Wales, UK), ALTERNA FUEL 100P (Dyadic), andALTERNA FUEL 200P (Dyadic).

Examples of xylanases useful in the processes of the present inventioninclude, but are not limited to, xylanases from Aspergillus aculeatus(GeneSeqP:AAR63790; WO 94/21785), Aspergillus fumigatus (WO2006/078256), Penicillium pinophilum (WO 2011/041405), Penicillium sp.(WO 2010/126772), Thermomyces lanuginosus (GeneSeqP:BAA22485),Talaromyces thermophilus (GeneSeqP:BAA22834), Thielavia terrestris NRRL8126 (WO 2009/079210), and Trichophaea saccata (WO 2011/057083).

Examples of beta-xylosidases useful in the processes of the presentinvention include, but are not limited to, beta-xylosidases fromNeurospora crassa (SwissProt:Q7SOW4), Trichoderma reesei(UniProtKB/TrEMBL:Q92458), Talaromyces emersonii (SwissProt:Q8X212), andTalaromyces thermophilus (GeneSeqP:BAA22816).

Examples of acetylxylan esterases useful in the processes of the presentinvention include, but are not limited to, acetylxylan esterases fromAspergillus aculeatus (WO 2010/108918), Chaetomium globosum(UniProt:Q2GWX4), Chaetomium gracile (GeneSeqP:AAB82124), Humicolainsolens DSM 1800 (WO 2009/073709), Hypocrea jecorina (WO 2005/001036),Myceliophtera thermophila (WO 2010/014880), Neurospora crassa(UniProt:q7s259), Phaeosphaeria nodorum (UniProt:QOUHJ1), and Thielaviaterrestris NRRL 8126 (WO 2009/042846).

Examples of feruloyl esterases (ferulic acid esterases) useful in theprocesses of the present invention include, but are not limited to,feruloyl esterases form Humicola insolens DSM 1800 (WO 2009/076122),Neosartorya fischeri (UniProt:A1D9T4), Neurospora crassa(UniProt:Q9HGR3), Penicillium aurantiogriseum (WO 2009/127729), andThielavia terrestris (WO 2010/053838 and WO 2010/065448).

Examples of arabinofuranosidases useful in the processes of the presentinvention include, but are not limited to, arabinofuranosidases fromAspergillus niger (GeneSeqP:AAR94170), Humicola insolens DSM 1800 (WO2006/114094 and WO 2009/073383), and M. giganteus (WO 2006/114094).

Examples of alpha-glucuronidases useful in the processes of the presentinvention include, but are not limited to, alpha-glucuronidases fromAspergillus clavatus (UniProt:alcc12), Aspergillus fumigatus(SwissProt:Q4WW45), Aspergillus niger (UniProt:Q96WX9), Aspergillusterreus (SwissProt:Q0CJP9), Humicola insolens (WO 2010/014706),Penicillium aurantiogriseum (WO 2009/068565), Talaromyces emersonii(UniProt:Q8X211), and Trichoderma reesei (UniProt:Q99024).

In a preferred embodiment, the enzyme composition is a high temperaturecomposition, i.e., a composition that is able to hydrolyze a cellulosicmaterial in the range of about 55° C. to about 70° C. In anotherpreferred embodiment, the enzyme composition is a high temperaturecomposition, i.e., a composition that is able to hydrolyze a cellulosicmaterial at a temperature of about 55° C., about 56° C., about 57° C.,about 58° C., about 59° C., about 60° C., about 61° C., about 62° C.,about 63° C., about 64° C., about 65° C., about 66° C., about 67° C.,about 68° C., about 69° C., or about 70° C. In another preferredembodiment, the enzyme composition is a high temperature composition,i.e., a composition that is able to hydrolyze a cellulosic material at atemperature of at least 55° C., at least 56° C., at least 57° C., atleast 58° C., at least 59° C., at least 60° C., at least 61° C., atleast 62° C., at least 63° C., at least 64° C., at least 65° C., atleast 66° C., at least 67° C., at least 68° C., at least 69° C., or atleast 70° C.

In another preferred embodiment, the enzyme composition is a hightemperature composition as disclosed in WO 2011/057140, which isincorporated herein in its entirety by reference.

The polypeptides having enzyme activity used in the processes of thepresent invention may be produced by fermentation of the above-notedmicrobial strains on a nutrient medium containing suitable carbon andnitrogen sources and inorganic salts, using procedures known in the art(see, e.g., Bennett, J. W. and LaSure, L. (eds.), More GeneManipulations in Fungi, Academic Press, CA, 1991). Suitable media areavailable from commercial suppliers or may be prepared according topublished compositions (e.g., in catalogues of the American Type CultureCollection). Temperature ranges and other conditions suitable for growthand enzyme production are known in the art (see, e.g., Bailey, J. E.,and Ollis, D. F., Biochemical Engineering Fundamentals, McGraw-Hill BookCompany, NY, 1986).

The fermentation can be any method of cultivation of a cell resulting inthe expression or isolation of an enzyme or protein. Fermentation may,therefore, be understood as comprising shake flask cultivation, orsmall- or large-scale fermentation (including continuous, batch,fed-batch, or solid state fermentations) in laboratory or industrialfermentors performed in a suitable medium and under conditions allowingthe enzyme to be expressed or isolated. The resulting enzymes producedby the methods described above may be recovered from the fermentationmedium and purified by conventional procedures.

Fermentation.

The fermentable sugars obtained from the hydrolyzed cellulosic materialcan be fermented by one or more (e.g., several) fermentingmicroorganisms capable of fermenting the sugars directly or indirectlyinto a desired fermentation product. “Fermentation” or “fermentationprocess” refers to any fermentation process or any process comprising afermentation step. Fermentation processes also include fermentationprocesses used in the consumable alcohol industry (e.g., beer and wine),dairy industry (e.g., fermented dairy products), leather industry, andtobacco industry. The fermentation conditions depend on the desiredfermentation product and fermenting organism and can easily bedetermined by one skilled in the art.

In the fermentation step, sugars, released from the cellulosic materialas a result of the pretreatment and enzymatic hydrolysis steps, arefermented to a product, e.g., ethanol, by a fermenting organism, such asyeast. Hydrolysis (saccharification) and fermentation can be separate orsimultaneous.

Any suitable hydrolyzed cellulosic material can be used in thefermentation step in practicing the present invention. The material isgenerally selected based on economics, i.e., costs per equivalent sugarpotential, and recalcitrance to enzymatic conversion.

The term “fermentation medium” is understood herein to refer to a mediumbefore the fermenting microorganism(s) is(are) added, such as, a mediumresulting from a saccharification process, as well as a medium used in asimultaneous saccharification and fermentation process (SSF).

“Fermenting microorganism” refers to any microorganism, includingbacterial and fungal organisms, suitable for use in a desiredfermentation process to produce a fermentation product. The fermentingorganism can be hexose and/or pentose fermenting organisms, or acombination thereof. Both hexose and pentose fermenting organisms arewell known in the art. Suitable fermenting microorganisms are able toferment, i.e., convert, sugars, such as glucose, xylose, xylulose,arabinose, maltose, mannose, galactose, and/or oligosaccharides,directly or indirectly into the desired fermentation product. Examplesof bacterial and fungal fermenting organisms producing ethanol aredescribed by Lin et al., 2006, Appl. Microbiol. Biotechnol. 69: 627-642.

Examples of fermenting microorganisms that can ferment hexose sugarsinclude bacterial and fungal organisms, such as yeast. Yeast includestrains of Candida, Kluyveromyces, and Saccharomyces, e.g., Candidasonorensis, Kluyveromyces marxianus, and Saccharomyces cerevisiae.

Examples of fermenting organisms that can ferment pentose sugars intheir native state include bacterial and fungal organisms, such as someyeast. Xylose fermenting yeast include strains of Candida, preferably C.sheatae or C. sonorensis; and strains of Pichia, e.g., P. stipitis, suchas P. stipitis CBS 5773. Pentose fermenting yeast include strains ofPachysolen, preferably P. tannophilus. Organisms not capable offermenting pentose sugars, such as xylose and arabinose, may begenetically modified to do so by methods known in the art.

Examples of bacteria that can efficiently ferment hexose and pentose toethanol include, for example, Bacillus coagulans, Clostridiumacetobutylicum, Clostridium thermocellum, Clostridium phytofermentans,Geobacillus sp., Thermoanaerobacter saccharolyticum, and Zymomonasmobilis (Philippidis, G. P., 1996, Cellulose bioconversion technology,in Handbook on Bioethanol: Production and Utilization, Wyman, C. E.,ed., Taylor & Francis, Washington, D.C., 179-212).

Other fermenting organisms include strains of Bacillus, such as Bacilluscoagulans; Candida, such as C. sonorensis, C. methanosorbosa, C.diddensiae, C. parapsilosis, C. naedodendra, C. blankii, C.entomophilia, C. brassicae, C. pseudotropicalis, C. boidinii, C. utilis,and C. scehatae; Clostridium, such as C. acetobutylicum, C.thermocellum, and C. phytofermentans; E. coli, especially E. colistrains that have been genetically modified to improve the yield ofethanol; Geobacillus sp.; Hansenula, such as Hansenula anomala;Klebsiella, such as K. oxytoca; Kluyveromyces, such as K. marxianus, K.lactis, K. thermotolerans, and K. fragilis; Schizosaccharomyces, such asS. pombe; Thermoanaerobacter, such as Thermoanaerobactersaccharolyticum; and Zymomonas, such as Zymomonas mobilis.

Commercially available yeast suitable for ethanol production include,e.g., BIOFERM™ AFT and XR (NABC—North American Bioproducts Corporation,GA, USA), ETHANOL RED™ yeast (Fermentis/Lesaffre, USA), FALI™(Fleischmann's Yeast, USA), FERMIOL™ (DSM Specialties), GERT STRAND™(Gert Strand AB, Sweden), and SUPERSTART™ and THERMOSACC™ fresh yeast(Ethanol Technology, WI, USA).

In an aspect, the fermenting microorganism has been genetically modifiedto provide the ability to ferment pentose sugars, such as xyloseutilizing, arabinose utilizing, and xylose and arabinose co-utilizingmicroorganisms.

The cloning of heterologous genes into various fermenting microorganismshas led to the construction of organisms capable of converting hexosesand pentoses to ethanol (co-fermentation) (Chen and Ho, 1993, Appl.Biochem. Biotechnol. 39-40: 135-147; Ho et al., 1998, Appl. Environ.Microbiol. 64: 1852-1859; Kotter and Ciriacy, 1993, Appl. Microbiol.Biotechnol. 38: 776-783; Walfridsson et al., 1995, Appl. Environ.Microbiol. 61: 4184-4190; Kuyper et al., 2004, FEMS Yeast Research 4:655-664; Beall et al., 1991, Biotech. Bioeng. 38: 296-303; Ingram etal., 1998, Biotechnol. Bioeng. 58: 204-214; Zhang et al., 1995, Science267: 240-243; Deanda et al., 1996, Appl. Environ. Microbiol. 62:4465-4470; WO 03/062430).

In one aspect, the fermenting organism comprises a polynucleotideencoding a polypeptide having cellulolytic enhancing activity of thepresent invention.

In another aspect, the fermenting organism comprises one or morepolynucleotides encoding one or more cellulolytic enzymes,hemicellulolytic enzymes, and accessory enzymes described herein.

It is well known in the art that the organisms described above can alsobe used to produce other substances, as described herein.

The fermenting microorganism is typically added to the degradedcellulosic material or hydrolysate and the fermentation is performed forabout 8 to about 96 hours, e.g., about 24 to about 60 hours. Thetemperature is typically between about 26° C. to about 60° C., e.g.,about 32° C. or 50° C., and about pH 3 to about pH 8, e.g., pH 4-5, 6,or 7.

In one aspect, the yeast and/or another microorganism are applied to thedegraded cellulosic material and the fermentation is performed for about12 to about 96 hours, such as typically 24-60 hours. In another aspect,the temperature is preferably between about 20° C. to about 60° C.,e.g., about 25° C. to about 50° C., about 32° C. to about 50° C., orabout 32° C. to about 50° C., and the pH is generally from about pH 3 toabout pH 7, e.g., about pH 4 to about pH 7. However, some fermentingorganisms, e.g., bacteria, have higher fermentation temperature optima.Yeast or another microorganism is preferably applied in amounts ofapproximately 10⁵ to 10¹², preferably from approximately 10⁷ to 10¹⁰,especially approximately 2×10⁸ viable cell count per ml of fermentationbroth. Further guidance in respect of using yeast for fermentation canbe found in, e.g., “The Alcohol Textbook” (Editors K. Jacques, T. P.Lyons and D. R. Kelsall, Nottingham University Press, United Kingdom1999), which is hereby incorporated by reference.

A fermentation stimulator can be used in combination with any of theprocesses described herein to further improve the fermentation process,and in particular, the performance of the fermenting microorganism, suchas, rate enhancement and ethanol yield. A “fermentation stimulator”refers to stimulators for growth of the fermenting microorganisms, inparticular, yeast. Preferred fermentation stimulators for growth includevitamins and minerals. Examples of vitamins include multivitamins,biotin, pantothenate, nicotinic acid, meso-inositol, thiamine,pyridoxine, para-aminobenzoic acid, folic acid, riboflavin, and VitaminsA, B, C, D, and E. See, for example, Alfenore et al., Improving ethanolproduction and viability of Saccharomyces cerevisiae by a vitaminfeeding strategy during fed-batch process, Springer-Verlag (2002), whichis hereby incorporated by reference. Examples of minerals includeminerals and mineral salts that can supply nutrients comprising P, K,Mg, S, Ca, Fe, Zn, Mn, and Cu.

Fermentation Products:

A fermentation product can be any substance derived from thefermentation. The fermentation product can be, without limitation, analcohol (e.g., arabinitol, n-butanol, isobutanol, ethanol, glycerol,methanol, ethylene glycol, 1,3-propanediol [propylene glycol],butanediol, glycerin, sorbitol, and xylitol); an alkane (e.g., pentane,hexane, heptane, octane, nonane, decane, undecane, and dodecane), acycloalkane (e.g., cyclopentane, cyclohexane, cycloheptane, andcyclooctane), an alkene (e.g., pentene, hexene, heptene, and octene); anamino acid (e.g., aspartic acid, glutamic acid, glycine, lysine, serine,and threonine); a gas (e.g., methane, hydrogen (H₂), carbon dioxide(CO₂), and carbon monoxide (CO)); isoprene; a ketone (e.g., acetone); anorganic acid (e.g., acetic acid, acetonic acid, adipic acid, ascorbicacid, citric acid, 2,5-diketo-D-gluconic acid, formic acid, fumaricacid, glucaric acid, gluconic acid, glucuronic acid, glutaric acid,3-hydroxypropionic acid, itaconic acid, lactic acid, malic acid, malonicacid, oxalic acid, oxaloacetic acid, propionic acid, succinic acid, andxylonic acid); and polyketide.

In one aspect, the fermentation product is an alcohol. The term“alcohol” encompasses a substance that contains one or more hydroxylmoieties. The alcohol can be, but is not limited to, n-butanol,isobutanol, ethanol, methanol, arabinitol, butanediol, ethylene glycol,glycerin, glycerol, 1,3-propanediol, sorbitol, xylitol. See, forexample, Gong et al., 1999, Ethanol production from renewable resources,in Advances in Biochemical Engineering/Biotechnology, Scheper, T., ed.,Springer-Verlag Berlin Heidelberg, Germany, 65: 207-241; Silveira andJonas, 2002, Appl. Microbiol. Biotechnol. 59: 400-408; Nigam and Singh,1995, Process Biochemistry 30(2): 117-124; Ezeji et al., 2003, WorldJournal of Microbiology and Biotechnology 19(6): 595-603.

In another aspect, the fermentation product is an alkane. The alkane maybe an unbranched or a branched alkane. The alkane can be, but is notlimited to, pentane, hexane, heptane, octane, nonane, decane, undecane,or dodecane.

In another aspect, the fermentation product is a cycloalkane. Thecycloalkane can be, but is not limited to, cyclopentane, cyclohexane,cycloheptane, or cyclooctane.

In another aspect, the fermentation product is an alkene. The alkene maybe an unbranched or a branched alkene. The alkene can be, but is notlimited to, pentene, hexene, heptene, or octene.

In another aspect, the fermentation product is an amino acid. Theorganic acid can be, but is not limited to, aspartic acid, glutamicacid, glycine, lysine, serine, or threonine. See, for example, Richardand Margaritis, 2004, Biotechnology and Bioengineering 87(4): 501-515.

In another aspect, the fermentation product is a gas. The gas can be,but is not limited to, methane, H₂, CO₂, or CO. See, for example,Kataoka et al., 1997, Water Science and Technology 36(6-7): 41-47; andGunaseelan, 1997, Biomass and Bioenergy 13(1-2): 83-114.

In another aspect, the fermentation product is isoprene.

In another aspect, the fermentation product is a ketone. The term“ketone” encompasses a substance that contains one or more ketonemoieties. The ketone can be, but is not limited to, acetone.

In another aspect, the fermentation product is an organic acid. Theorganic acid can be, but is not limited to, acetic acid, acetonic acid,adipic acid, ascorbic acid, citric acid, 2,5-diketo-D-gluconic acid,formic acid, fumaric acid, glucaric acid, gluconic acid, glucuronicacid, glutaric acid, 3-hydroxypropionic acid, itaconic acid, lacticacid, malic acid, malonic acid, oxalic acid, propionic acid, succinicacid, or xylonic acid. See, for example, Chen and Lee, 1997, Appl.Biochem. Biotechnol. 63-65: 435-448.

In another aspect, the fermentation product is polyketide.

Recovery.

The fermentation product(s) can be optionally recovered from thefermentation medium using any method known in the art including, but notlimited to, chromatography, electrophoretic procedures, differentialsolubility, distillation, or extraction. For example, alcohol isseparated from the fermented cellulosic material and purified byconventional methods of distillation. Ethanol with a purity of up toabout 96 vol. % can be obtained, which can be used as, for example, fuelethanol, drinking ethanol, i.e., potable neutral spirits, or industrialethanol.

Signal Peptide

The present invention also relates to an isolated polynucleotideencoding a signal peptide comprising or consisting of amino acids 1 to21 of SEQ ID NO: 2 or amino acids 1 to 23 of SEQ ID NO: 4. Thepolynucleotide may further comprise a gene encoding a protein, which isoperably linked to the signal peptide. The protein is preferably foreignto the signal peptide. In one aspect, the polynucleotide encoding thesignal peptide is nucleotides 1 to 63 of SEQ ID NO: 1 or nucleotides 1to 69 of SEQ ID NO: 3.

The present invention also relates to nucleic acid constructs,expression vectors and recombinant host cells comprising suchpolynucleotides.

The present invention also relates to methods of producing a protein,comprising (a) cultivating a recombinant host cell comprising suchpolynucleotide; and optionally (b) recovering the protein.

The protein may be native or heterologous to a host cell. The term“protein” is not meant herein to refer to a specific length of theencoded product and, therefore, encompasses peptides, oligopeptides, andpolypeptides. The term “protein” also encompasses two or morepolypeptides combined to form the encoded product. The proteins alsoinclude hybrid polypeptides and fused polypeptides.

Preferably, the protein is a hormone, enzyme, receptor or portionthereof, antibody or portion thereof, or reporter. For example, theprotein may be a hydrolase, isomerase, ligase, lyase, oxidoreductase, ortransferase, e.g., an alpha-galactosidase, alpha-glucosidase,aminopeptidase, amylase, beta-galactosidase, beta-glucosidase,beta-xylosidase, carbohydrase, carboxypeptidase, catalase,cellobiohydrolase, cellulase, chitinase, cutinase, cyclodextringlycosyltransferase, deoxyribonuclease, endoglucanase, esterase,glucoamylase, invertase, laccase, lipase, mannosidase, mutanase,oxidase, pectinolytic enzyme, peroxidase, phytase, polyphenoloxidase,proteolytic enzyme, ribonuclease, transglutaminase, or xylanase.

The gene may be obtained from any prokaryotic, eukaryotic, or othersource.

The present invention is further described by the following examplesthat should not be construed as limiting the scope of the invention.

EXAMPLES Strain

Talaromyces leycettanus CBS 398.68 was used as the source of the GH61polypeptide coding sequence. The strain is available from TheCentraalbureau voor Schimmelcultures (CBS), Utrecht, the Netherlands.

Media and Solutions

COVE sucrose plates were composed of 342 g of sucrose, 20 g of agarpowder, 20 ml of COVE salt solution, and deionized water to 1 liter. Themedium was sterilized by autoclaving at 15 psi for 15 minutes(Bacteriological Analytical Manual, 8th Edition, Revision A, 1998). Themedium was cooled to 60° C. and then acetamide to 10 mM, CsCl to 15 mM,and TRITON® X-100 (50 μl/500 ml) were added.

COVE top agarose was composed of 342.3 g of sucrose, 20 ml of COVE saltsolution, 10 mM acetamide, 15 mM CsCl, 6 g of SEAKEM® GTG® agarose(Lonza Group Ltd., Basel, Switzerland), and deionized water to 1 liter.

COVE-2 plates for isolation were composed of 30 g of sucrose, 20 ml ofCOVE salt solution, 10 mM acetamide, 30 g of Noble agar, and deionizedwater to 1 liter.

COVE salt solution was composed of 26 g of MgSO₄.7H₂O, 26 g of KCl, 26 gof KH₂PO₄, 50 ml of COVE trace metals solution, and deionized water to 1liter.

COVE trace metals solution was composed of 0.04 g of Na₂B₄O₇.10H₂O, 0.4g of CuSO₄.5H₂O, 1.2 g of FeSO₄.7H₂O, 0.7 g of MnSO₄.H₂O, 0.8 g ofNa₂MoO₄.2H₂O, 10 g of ZnSO₄.7H₂O, and deionized water to 1 liter.

LB medium was composed of 10 g of tryptone, 5 g of yeast extract, 5 g ofsodium chloride, and deionized water to 1 liter.

LB plates were composed of LB medium and 15 g of Bacto agar per liter.

PDA plates were composed of potato infusion made by boiling 300 g ofsliced potatoes (washed but unpeeled) in water for 30 minutes and thendecanting or straining the broth through cheesecloth. Distilled waterwas then added until the total volume of the suspension was one liter,followed by 20 g (w/v) of dextrose and 20 g (w/v) of agar powder. Themedium was sterilized by autoclaving at 15 psi for 15 minutes(Bacteriological Analytical Manual, 8th Edition, Revision A, 1998).

60% PEG solution was composed of 60% (w/v) polyethyleneglycol (PEG)4000, 10 mM CaCl₂, and 10 mM Tris-HCl pH 7.5 in deionized water. Thesolution was filtered using a 0.22 μm PES membrane filter (MilliporeCorp., Billerica, Mass., USA) for sterilization. After filtersterilization, the PEG 60% was stored in aliquots at −20 C until use.

YP+2% glucose medium was composed of 1% yeast extract, 2% peptone, and2% glucose in deionized water.

YP+2% maltodextrin medium was composed of 1% yeast extract, 2% peptone,and 2% maltodextrin in deionized water.

YPM medium was composed of 1% yeast extract, 2% of peptone, and 2% ofmaltose in deionized water.

Example 1: Genomic Sequencing of Talaromyces leycettanus CBS 398.68 fora GH61 Polypeptide Coding Sequence

Talaromyces leycettanus CBS 398.68 was cultured on PDA plates at 26° C.for 5 days. The mycelia were then inoculated into 500 ml flaskscontaining YP+2% glucose medium and incubated at 26° C. for 3 days withshaking at 85 rpm. Mycelia were harvested from the flasks by filtrationof the cultivation medium through a Buchner vacuum funnel lined withMIRACLOTH® (EMD Millipore, Billerica, Mass., USA). The collected myceliawere frozen in liquid nitrogen and stored at −80° C. until use. Highquality genomic DNA, suitable for sequencing, was isolated using aDNEASY® Plant Maxi Kit (QIAGEN GMBH, Hilden Germany) according to themanufacturer's instructions.

Genomic sequence information was generated by Illumina HiSeq 2000equipment at the Beijing Genome Institute (BGI), BGI Huabei Region,Beijing Konggang Industrial Zone, China. Totally 9.5 μg of the isolatedT. leycettanus CBS 398.68 genomic DNA was sent to BGI for preparationand analysis and a 100 bp paired end strategy was employed. Threelibrary sizes were prepared and sequenced with insert size ranges of200, 700, and 45000 base pairs respectively. One half of a HiSeq run wasused. The reads resulted in 14,542,594 bp with an N-50 of 151,812. Geneswere called using GeneMark.hmm ES version 2.3a and identification of thecatalytic domain was made using “Glyco_hydro_61” Hidden Markov Modelprovided by Pfam.

Example 2: Cloning of the P23XBM GH61 Polypeptide Coding Sequence fromTalaromyces leycettanus CBS 398.68 Genomic DNA

The P23XBM GH61 polypeptide coding sequence was cloned from Talaromycesleycettanus CBS 398.68 genomic DNA (Example 1) by PCR using the primersdescribed below.

Primer KKSC31-F: (SEQ ID NO: 5)5′-ACACAACTGGGGATCCACCATGGCCTTCTCAAAGGTTGC-3′ Primer KKSC31-R:(SEQ ID NO: 6) 5′-AGATCTCGAGAAGCTT ATCAGGAAGAGCCAGTCCACA-3′Bold letters represent the Talaromyces leycettanus P23XBM GH61polypeptide coding sequence. Bam HI and Hind III restriction sites areunderlined. The sequences to the left of the restriction sites arehomologous to the insertion sites of plasmid pDau109 (WO 2005/042735).

The amplification reaction (40 μl) was composed of 12.5 μl of 2× IPROOF™HF Master Mix (Bio-Rad Laboratories, Inc., Hercules, Calif., USA), 0.5μl of primer KKSC31-F (100 μM), 0.5 μl of primer KKSC31-R (100 μM), 0.5μl of Talaromyces leycettanus genomic DNA (100 ng/μl), and 22 μl ofdeionized water. The PCR was incubated in a DYAD® Dual-Block ThermalCycler (MJ Research Inc., Waltham, Mass., USA) programmed for 1 cycle at98° C. for 30 seconds; 25 cycles each at 98° C. for 10 seconds, 55° C.for 20 seconds, and 72° C. for 30 seconds; and 1 cycle at 72° C. for 10minutes. Samples were cooled to 10° C. before removal and furtherprocessing.

Five μl of the PCR were analyzed by 1% agarose gel electrophoresis using40 mM Tris base, 20 mM sodium acetate, 1 mM disodium EDTA (TAE) bufferwhere a major band at approximately 856 bp was observed. The 856 bp PCRproduct was excised from the agarose gel and extracted using anILLUSTRA™ GFX™ PCR DNA and Gel Band Purification Kit (GE Healthcare,Piscataway, N.J., USA).

Two μg of plasmid pDau109 were digested with Bam HI and Hind III toremove the stuffer fragment from the restricted plasmid and the digestedplasmid was analyzed by 1% agarose gel electrophoresis using 50 mM Trisbase-50 mM boric acid-1 mM disodium EDTA (TBE) buffer. The bands werevisualized by the addition of SYBR® Safe DNA gel stain (LifeTechnologies Corporation, Grand Island, N.Y., USA) and detection at 470nm. The band corresponding to the restricted plasmid was excised fromthe gel and purified using an ILLUSTRA™ GFX™ PCR DNA and Gel BandPurification Kit. The plasmid was eluted into 10 mM Tris pH 8.0 and itsconcentration adjusted to 20 ng per μl. An IN-FUSION® PCR Cloning Kit(Clontech Laboratories, Inc., Mountain View, Calif., USA) was used toclone the 856 bp PCR fragment (50 ng) into plasmid pDau109 digested withBam HI and Hind III (20 ng). The IN-FUSION® total reaction volume was 10μl. The IN-FUSION® reaction was transformed into FUSION-BLUE™ E. colicells (Clontech Laboratories, Inc., Mountain View, Calif., USA)according to the manufacturer's protocol and spread onto LB platessupplemented with 50 μg of ampicillin per ml. After incubation overnightat 37° C., transformant colonies were observed growing on the plates.

Several colonies were selected for analysis by colony PCR using plasmidpDau222 primers shown below. Eight colonies were transferred from the LBplates supplemented with 50 μg of ampicillin per ml with a yellowinoculation pin (Nunc A/S, Denmark) to new LB plates supplemented with50 μg of ampicillin per ml and incubated overnight at 37° C.

Primer 8653: (SEQ ID NO: 7) 5′-GCAAGGGATGCCATGCTTGG-3′ Primer 8654:(SEQ ID NO: 8) 5′-CATATAACCAATTGCCCTC-3′

Each of the eight colonies were transferred directly into 200 μl PCRtubes composed of 6 μl of 2× HiFi REDDYMIX™ PCR Master Mix (ThermoFisher Scientific, Rockford, Ill., USA), 0.5 μl of primer 8653 (10μmole/μl), 0.5 μl of primer 8654 (10 μmole/μl), and 5 μl of deionizedwater. Each colony PCR was incubated in a DYAD® Dual-Block ThermalCycler programmed for 1 cycle at 94° C. for 60 seconds; and 30 cycleseach at 94° C. for 30 seconds, 53° C. for 30 seconds, 68° C. for 60seconds, 68° C. for 10 minutes, and 10° C. for 10 minutes.

Four μl of each completed PCR were submitted to 1% agarose gelelectrophoresis using TAE buffer. All eight E. coli transformants showeda PCR band at approximately 856 kb. Plasmid DNA was isolated from eachof the eight colonies using a QIAPREP® Spin Miniprep Kit (QIAGEN GMBH,Hilden Germany). The resulting plasmid DNA was sequenced with primers8653 and 8654 using an Applied Biosystems Model 3700 Automated DNASequencer and version 3.1 BIG-DYE™ terminator chemistry (AppliedBiosystems, Inc., Foster City, Calif., USA). One plasmid, designatedpKKSC31-1, was chosen for expression in Aspergillus oryzae MT3568. A.oryzae MT3568 is an amdS (acetamidase) disrupted gene derivative ofAspergillus oryzae JaL355 (WO 2002/40694) in which pyrG auxotrophy wasrestored by inactivating the A. oryzae amdS gene. Protoplasts of A.oryzae MT3568 were prepared according to the method described in EP 0238 023 B1, pages 14-15.

E. coli KKSC31-1 containing pKKSC31-1 was grown overnight at 37° C. inLB medium supplemented with 50 μg of ampicillin per ml and plasmid DNAof pKKSC31-1 was isolated using a Plasmid Midi Kit (QIAGEN GMBH, HildenGermany). The purified plasmid DNA was transformed into Aspergillusoryzae MT3568 according to the method described in WO 2005/042735.Briefly, 8 μl of plasmid DNA representing 3 μg of DNA were added to 100μl of A. oryzae MT3568 protoplasts. Then 250 μl of 60% PEG solution wereadded and the tubes were gently mixed and incubated at 37° C. for 30minutes. The mix was added to 10 ml of premelted COVE top agarose, whichwas equilibrated to 40° C. in a water bath before adding the protoplastmixture. The combined mixture was then plated onto two COVE sucroseplates. The plates were incubated at 37° C. for 4 days. Singletransformed colonies were identified by growth on acetamide as a carbonsource. Several of the A. oryzae transformants were inoculated into 750μl of YP+2% glucose medium and 750 μl of YP+2% maltodextrin in 96 welldeep plates and incubated at 37° C. stationary for 4 days. The sametransformants were also restreaked on COVE-2 plates.

Culture broth from the Aspergillus oryzae transformants was thenanalyzed for production of the P23XBM GH61 polypeptide by SDS-PAGE usinga NUPAGE® 10% Bis-Tris SDS gels (Invitrogen, Carlsbad, Calif., USA)according to the manufacturer. One band at approximately 30 kDa wasobserved for each of the Aspergillus oryzae transformants. One A. oryzaetransformant producing the P23XBM GH61 polypeptide was designated A.oryzae EXP03714.

Example 3: Characterization of a Talaromyces leycettanus Genomic DNAEncoding a GH61 Polypeptide (P23XBM)

The genomic DNA sequence and deduced amino acid sequence of aTalaromyces leycettanus GH61 polypeptide coding sequence are shown inSEQ ID NO: 1 (D72NHC) and SEQ ID NO: 2 (P23XBM), respectively. Thecoding sequence is 820 bp including the stop codon, which is interruptedby 1 intron of 64 bp (nucleotides 102 to 165). The encoded predictedprotein is 251 amino acids. Using the SignalP 3.0 program (Bendtsen etal., 2004, supra), a signal peptide of 21 residues was predicted. TheSignalP prediction is in accord with the necessity for having ahistidine residue at the N-terminus in order for proper metal bindingand hence protein function to occur (See Harris et al., 2010,Biochemistry 49: 3305, and Quinlan et al., 2011, Proc. Natl. Acad. Sci.USA 108: 15079). The predicted mature protein contains 230 amino acidswith a predicted molecular mass of 24,726 Da and a predicted isoelectricpoint of 4.3.

A comparative pairwise global alignment of amino acid sequences wasdetermined using the Needleman and Wunsch algorithm (Needleman andWunsch, 1970, supra) with a gap open penalty of 10, a gap extensionpenalty of 0.5, and the EBLOSUM62 matrix. The alignment showed that thededuced amino acid sequence of the Talaromyces leycettanus genomic DNAencoding the P23XBM GH61 polypeptide shares 68.57% identity (excludinggaps) to the deduced amino acid sequence of a GH61 polypeptide fromTalaromyces emersonii (GENESEQP:AZR89286).

Example 4: Preparation of the Talaromyces leycettanus P23XBM GH61Polypeptide

A. oryzae EXP03714 was fermented in 500 ml Erlenmeyer flasks containing100 ml of YPM supplemented with 2% glucose for 4 days at 25° C. withagitation at 100 rpm. The broth of the Talaromyces leycettanus GH61polypeptide was filtered using MIRACLOTH®. A 100 ml volume of thefiltered broth was concentrated to about 10 ml using VIVASPIN 20 (10 kDaMWCO) spin concentrators (Sartorius Stedium Biotech, Goettingen,Germany) and centrifuging (Sorvall, Legend RT+Centrifuge, ThermoScientific, Germany) at 3000 rpm for 15 minute intervals repeatedly. Thetotal protein content of the GH61 polypeptide was determined by gelquantitation following quantitative desalting. A 3 ml volume of theconcentrated GH61 polypeptide broth was desalted and buffer exchangedinto 50 mM sodium acetate pH 5.0 buffer using an ECONO-PAC® 10-DGdesalting column (Bio-Rad Laboratories, Inc., Hercules, Calif., USA).Protein concentration was determined by SDS-PAGE using an 8-16% Tris HClCRITERION STAIN FREE™ gel (Bio-Rad Laboratories, Inc., Hercules, Calif.,USA) and a CRITERION STAIN FREE™ Imaging System (Bio-Rad Laboratories,Inc., Hercules, Calif., USA).

Example 5: Cloning of the P23XBP GH61 Polypeptide Coding Sequence fromTalaromyces leycettanus CBS 398.68 Genomic DNA

The P23XBP GH61 polypeptide coding sequence was cloned from Talaromycesleycettanus CBS 398.68 genomic DNA (Example 1) by PCR using the primersdescribed below.

Primer KKSC30-F: (SEQ ID NO: 9)5′-ACACAACTGGGGATCCACCATGCATCAACACTTCCGATACA-3′ Primer KKSC30-R:(SEQ ID NO: 10) 5′-AGATCTCGAGAAGCTT ATCAAGCACCAGTAGGAAGGC-3′Bold letters represent the Talaromyces leycettanus P23XBP GH61polypeptide coding sequence. Bam HI and Hind III restriction sites areunderlined. The sequences to the left of the restriction sites arehomologous to the insertion sites of plasmid pDau109.

The amplification reaction (25 μl) was composed of 12.5 μl of 2× IPROOF™HF Master Mix, 0.5 μl of primer KKSC30-F (100 μM), 0.5 μl of primerKKSC30-R (100 μM), 0.5 μl of Talaromyces leycettanus genomic DNA (100ng/μl), and 11 μl of deionized water. The PCR was incubated in a DYAD®Dual-Block Thermal Cycler programmed for 1 cycle at 98° C. for 30seconds; 25 cycles each at 98° C. for 10 seconds, 55° C. for 20 seconds,and 72° C. for 30 seconds; and 1 cycle at 72° C. for 10 minutes. Sampleswere cooled to 10° C. before removal and further processing.

Five μl of the PCR were analyzed by 1% agarose gel electrophoresis usingTAE buffer where a major band at approximately 1137 bp was observed. The1137 bp PCR product was excised from the agarose gel and extracted usingan ILLUSTRA™ GFX™ PCR DNA and Gel Band Purification Kit.

Two μg of plasmid pDau109 were digested with Bam HI and Hind III toremove the stuffer fragment from the restricted plasmid and the digestedplasmid was analyzed by 1% agarose gel electrophoresis using TBE buffer.The bands were visualized by the addition of SYBR® Safe DNA gel stainand detection at 470 nm. The band corresponding to the restrictedplasmid was excised from the gel and purified using an ILLUSTRA™ GFX™PCR DNA and Gel Band Purification Kit. The plasmid was eluted into 10 mMTris pH 8.0 and its concentration adjusted to 20 ng per μl. AnIN-FUSION® PCR Cloning Kit was used to clone the 856 bp PCR fragment (50ng) into plasmid pDau109 digested with Bam HI and Hind III (20 ng). TheIN-FUSION® total reaction volume was 10 μl. The IN-FUSION® reaction wastransformed into FUSION-BLUE™ E. coli cells and spread onto LB platessupplemented with 50 μg of ampicillin per ml. After incubation overnightat 37° C., transformant colonies were observed growing on the plates.

Several colonies were selected for analysis by colony PCR using plasmidpDau222 primers 8653 and 8654. Eight colonies were transferred from theLB plates supplemented with 50 μg of ampicillin per ml with a yellowinoculation pin (Nunc A/S, Denmark) to new LB plates supplemented with50 μg of ampicillin per ml and incubated overnight at 37° C.

Each of the eight colonies were transferred directly into 200 μl PCRtubes composed of 6 μl of 2× HiFi REDDYMIX™ PCR Master Mix, 0.5 μl ofprimer 8653 (10 μmole/μl), 0.5 μl of primer 8654 (10 μmole/μl), and 5 μlof deionized water. Each colony PCR was incubated in a DYAD® Dual-BlockThermal Cycler programmed for 1 cycle at 94° C. for 60 seconds; and 30cycles each at 94° C. for 30 seconds, 53° C. for 30 seconds, 68° C. for60 seconds, 68° C. for 10 minutes, and 10° C. for 10 minutes.

Four μl of each completed PCR were submitted to 1% agarose gelelectrophoresis using TAE buffer. All eight E. coli transformants showeda PCR band at approximately 1137 kb. Plasmid DNA was isolated from eachof the eight colonies using a QIAPREP® Spin Miniprep Kit. The resultingplasmid DNA was sequenced with primers 8653 and 8654 using an AppliedBiosystems Model 3700 Automated DNA Sequencer and version 3.1 BIG-DYE™terminator chemistry. One plasmid, designated pKKSC30-2, was chosen forexpression in Aspergillus oryzae MT3568. Protoplasts of A. oryzae MT3568were prepared according to the method described in EP 0 238 023 B1,pages 14-15.

E. coli KKSC30-2 containing pKKSC30-2 was grown overnight at 37° C. inLB medium supplemented with 50 μg of ampicillin per ml and plasmid DNAof pKKSC30-2 was isolated using a Plasmid Midi Kit. The purified plasmidDNA was transformed into Aspergillus oryzae MT3568 according to themethod described in WO 2005/042735. Briefly, 8 μl of plasmid DNArepresenting 3 μg of DNA were added to 100 μl of A. oryzae MT3568protoplasts. Then 250 μl of 60% PEG solution were added and the tubeswere gently mixed and incubated at 37° C. for 30 minutes. The mix wasadded to 10 ml of premelted COVE top agarose, which was equilibrated to40° C. in a warm water bath before adding the protoplast mixture. Thecombined mixture was then plated onto two COVE sucrose plates. Theplates were incubated at 37° C. for 4 days. Single transformed colonieswere identified by growth on acetamide as a carbon source. Several ofthe A. oryzae transformants were inoculated into 750 μl of YP+2% glucosemedium and 750 μl of YP+2% maltodextrin in 96 well deep plates andincubated at 37° C. stationary for 4 days. The same transformants werealso restreaked on COVE-2 plates.

Culture broth from the Aspergillus oryzae transformants was thenanalyzed for production of the P23XBP GH61 polypeptide by SDS-PAGE usinga NUPAGE® 10% Bis-Tris SDS gels according to the manufacturer. One bandat approximately 38 kDa was observed for each of the Aspergillus oryzaetransformants. One A. oryzae transformant producing the P23XBP GH61polypeptide was designated A. oryzae EXP03814.

Example 6: Characterization of a Talaromyces leycettanus Genomic DNAEncoding a GH61 Polypeptide (P23XBP)

The genomic DNA sequence and deduced amino acid sequence of aTalaromyces leycettanus GH61 polypeptide coding sequence are shown inSEQ ID NO: 3 (D72NHD) and SEQ ID NO: 4 (P23XBP), respectively. Thecoding sequence is 1101 bp including the stop codon, without anyintrons. The encoded predicted protein is 366 amino acids. Using theSignalP 3.0 program (Bendtsen et al., 2004, supra), a signal peptide of23 residues was predicted. The SignalP prediction is in accord with thenecessity for having a histidine reside at the N-terminus in order forproper metal binding and hence protein function to occur (See Harris etal., 2010, supra, and Quinlan et al., 2011, supra). A carbohydratebinding module of was observed on the C terminal of the peptide. Themodule belongs to the CBM1 family defined in CAZY (Boraston et al.,2004, Biochem. J. 382: 769-781). The binding module and linker encompassamino acid residues 258 to 366. The binding module encompasses aminoacid residues 326 to 366. The predicted mature protein contains 343amino acids with a predicted molecular mass of 35,351 Da and a predictedisoelectric point of 4.5.

A comparative pairwise global alignment of amino acid sequences wasdetermined using the Needleman and Wunsch algorithm (Needleman andWunsch, 1970, supra) with a gap open penalty of 10, a gap extensionpenalty of 0.5, and the EBLOSUM62 matrix. The alignment showed that thededuced amino acid sequence of the Talaromyces leycettanus genomic DNAencoding the P23XBP GH61 polypeptide shares 75.15% identity (excludinggaps) to the deduced amino acid sequence of a GH61 polypeptide fromAspergillus fumigatus (SWISSPROT:B0XZE1).

Example 7: Preparation of the Talaromyces leycettanus P23XBP GH61Polypeptide

A. oryzae EXP03714 strain was fermented in 500 ml Erlenmeyer flaskscontaining 100 ml of YP+2% glucose for 4 days at 25° C. with agitationat 100 rpm. The broth of the Talaromyces leycettanus GH61 polypeptidewas filtered using MIRACLOTH®. A 100 ml volume of the filtered broth wasconcentrated to about 10 ml using VIVASPIN 20 (10 kDa MWCO) spinconcentrators and centrifuging (Legend RT+Centrifuge) at 3000 rpm for 15minute intervals repeatedly. The total protein content of the GH61polypeptide was determined by gel quantitation following quantitativedesalting. A 3 ml volume of the concentrated GH61 polypeptide broth wasdesalted and buffer exchanged into 50 mM sodium acetate pH 5.0 using anECONO-PAC® 10-DG desalting column (Bio-Rad Laboratories, Inc., Hercules,Calif., USA). Protein concentration was determined by SDS-PAGE using an8-16% Tris HCl CRITERION STAIN FREE™ gel and a CRITERION STAIN FREE™Imaging System.

Example 8: Preparation of Trichoderma reesei GH5 Endoglucanase II

The Trichoderma reesei GH5 endoglucanase II (SEQ ID NO: 11 [DNAsequence] and SEQ ID NO: 12 [deduced amino acid sequence]) was preparedrecombinantly according to WO 2011/057140 using Aspergillus oryzae as ahost. The filtered broth of the T. reesei endoglucanase II was desaltedand buffer-exchanged into 20 mM Tris pH 8.0 using a tangential flowconcentrator (Pall Filtron, Northborough, Mass., USA) equipped with a 10kDa polyethersulfone membrane (Pall Filtron, Northborough, Mass., USA).The protein concentration was determined using a Microplate BCA™ ProteinAssay Kit (Thermo Fischer Scientific, Waltham, Mass., USA) in whichbovine serum albumin was used as a protein standard.

Example 9: Preparation of Aspergillus fumigatus Cel3A Beta-Glucosidase

The Aspergillus fumigatus NN055679 Cel3A beta-glucosidase. (SEQ ID NO:13 [DNA sequence] and SEQ ID NO: 14 [deduced amino acid sequence]) wasrecombinantly prepared according to WO 2005/047499 using Aspergillusoryzae as a host. The filtered broth was adjusted to pH 8.0 with 20%sodium acetate, which made the solution turbid. To remove the turbidity,the solution was centrifuged at 20,000×g for 20 minutes, and thesupernatant was filtered through a 0.2 μm filtration unit (Nalgene,Rochester, N.Y., USA). The filtrate was diluted with deionized water toreach the same conductivity as 50 mM Tris/HCl, pH 8.0. The adjustedenzyme solution was applied to a Q SEPHAROSE® Fast Flow column (GEHealthcare, Piscataway, N.J., USA) equilibrated in 50 mM Tris-HCl, pH8.0 and eluted with a linear 0 to 500 mM sodium chloride gradient.Fractions were pooled and treated with 1% (w/v) activated charcoal toremove color from the beta-glucosidase pool. The charcoal was removed byfiltration of the suspension through a 0.2 μm filtration unit. Thefiltrate was adjusted to pH 5.0 with 20% acetic acid and diluted 10times with deionized water. The adjusted filtrate was applied to a SPSEPHAROSE® Fast Flow column (GE Healthcare, Piscataway, N.J., USA)equilibrated in 10 mM succinic acid pH 5.0 and eluted with a linear 0 to500 mM sodium chloride gradient. Fractions were collected and analyzedfor beta-glucosidase activity using p-nitrophenyl-beta-D-glucopyranosideas substrate. A p-nitrophenyl-beta-D-glucopyranoside stock solution wasprepared by dissolving 50 mg of the substrate in 1.0 ml of DMSO. Justbefore use a substrate solution was prepared by mixing 100 μl of thestock solution with 4900 μl of 100 mM succinic acid, 100 mM HEPES, 100mM CHES, 100 mM CABS, 1 mM CaCl₂, 150 mM KCl, 0.01% TRITON® X-100, pH5.0 (assay buffer). A 200 μl volume of the substrate solution wasdispensed into a tube and placed on ice followed by 20 μl of enzymesample (diluted in 0.01% TRITON® X-100). The assay was initiated bytransferring the tube to a thermomixer, which was set to an assaytemperature of 37° C. The tube was incubated for 15 minutes on thethermomixer at its highest shaking rate (1400 rpm). The assay wasstopped by transferring the tube back to the ice bath and adding 600 μlof Stop solution (500 mM H₃BO₃/NaOH pH 9.7). Then the tube was mixed andallowed to reach room temperature. A 200 μl of supernatant wastransferred to a microtiter plate and the absorbance at 405 nm was readas a measure of beta-glucosidase activity. A buffer control was includedin the assay (instead of enzyme). Fractions with beta-glucosidaseactivity were further analyzed by SDS-PAGE. Fractions, where only oneband was seen on a Coomassie blue stained SDS-PAGE gel, were pooled asthe purified product. The protein concentration was determined using aMicroplate BCA™ Protein Assay Kit in which bovine serum albumin was usedas a protein standard.

Example 10: Microcrystalline Cellulose Hydrolysis Assay

A 5% microcrystalline cellulose slurry was prepared by addition of 2.5 gof microcrystalline cellulose (AVICEL® PH101; Sigma-Aldrich, St. Louis,Mo., USA) to a graduated 50 ml screw-cap conical tube followed byapproximately 40 ml of double-distilled water. The conical tube was thenmixed thoroughly by shaking/vortexing, and adjusted to 50 ml total withdouble-distilled water and mixed again. Contents of the tube were thenquickly transferred to a 100 ml beaker and stirred rapidly with amagnetic stirrer. The hydrolysis of microcrystalline cellulose wasconducted using 2.2 ml deep-well plates (Axygen, Union City, Calif.,USA) in a total reaction volume of 1.0 ml. The hydrolysis was performedwith 25 mg of the microcrystalline cellulose slurry (containing 100%cellulose) per ml of reaction. A 500 μl aliquot of the 5%microcrystalline cellulose slurry was pipetted into each well of the 2.2ml deep-well plate using a 1000 μl micropipette with a wide aperture tip(end of tip cut off about 2 mm from the base). Each reaction wasperformed with and without the addition of catechol. In reactions notcontaining catechol, 200 μl of double-distilled water were added to eachwell. Then 100 μl of 500 mM ammonium acetate pH 5.0 containing 100 μMcopper sulfate or 100 μl of 500 mM ammonium acetate pH 8.0 containing100 μM copper sulfate were added to each well. An enzyme mixtureconsisting of Trichoderma reesei GH5 endoglucanase II (loaded at 2 mgprotein per g cellulose) and Aspergillus fumigatus GH3 beta-glucosidase(loaded at 2 mg protein per g cellulose) was prepared and then addedsimultaneously to each well in a volume of 100 μl. An enzyme mixturecontaining the GH61 polypeptide (loaded at 5 mg protein per g cellulose)was then added to each well in a volume of 100 μl for a final volume of1 ml in each reaction not containing catechol. In the reactionscontaining catechol, 200 μl of 100 mM catechol were added to each of theappropriate wells for a final volume of 1 ml and a final catecholconcentration of 20 mM. The plate was then sealed using an ALPS-300™μlate heat sealer (Abgene, Epsom, United Kingdom), mixed thoroughly, andincubated at 50° C. for 72 hours. All experiments reported wereperformed in triplicate

Following hydrolysis, samples were filtered using a 0.45 μm MULTISCREEN®96-well filter plate (Millipore, Bedford, Mass., USA) and filtratesanalyzed for glucose content as described below. When not usedimmediately, filtered aliquots were frozen at −20° C. The glucoseconcentration of the samples were measured using a 4.6×250 mm AMINEX®HPX-87H column (Bio-Rad Laboratories, Inc., Hercules, Calif., USA) byelution with 0.05% w/w benzoic acid-0.005 M H₂SO₄ at 65° C. at a flowrate of 0.6 ml per minute, and quantitation by integration of theglucose signal from refractive index detection (CHEMSTATION®, AGILENT®1100 HPLC, Agilent Technologies, Santa Clara, Calif., USA) calibrated bypure glucose samples.

All HPLC data processing was performed using MICROSOFT EXCEL™ software(Microsoft, Richland, Wash., USA). The resultant glucose equivalentswere used for comparison of each reaction. Triplicate data points wereaveraged and standard deviation was calculated.

Example 11: Effect of the Talaromyces leycettanus P23XBM GH61Polypeptide on the Hydrolysis of Microcrystalline Cellulose

The Talaromyces leycettanus P23XBM GH61 polypeptide was evaluated forthe ability to enhance the hydrolysis of microcrystalline cellulose byTrichoderma reesei GH5 endoglucanase II (loaded at 2 mg protein per gcellulose) and Aspergillus fumigatus GH3 beta-glucosidase (loaded at 2mg protein per g cellulose) with and without the addition of 20 mMcatechol at 50° C. The Talaromyces leycettanus P23XBM GH61 polypeptidewas added at 5 mg protein per g cellulose. The mixture of T. reesei GH5endoglucanase II (loaded at 2 mg protein per g cellulose) and A.fumigatus GH3 beta-glucosidase (loaded at 2 mg protein per g cellulose)was also run as a control without added GH61 polypeptide.

The assay was performed as described in Example 10. The 1 ml reactionswith microcrystalline cellulose were conducted for 72 hours in 50 mMammonium acetate pH 5.0 containing 10 μM copper sulfate or 50 mMammonium acetate pH 8.0 containing 10 μM copper sulfate. All reactionswere performed in triplicate and involved single mixing at the beginningof hydrolysis.

As shown in FIGS. 1 and 2, hydrolysis of the microcrystalline celluloseby the mixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase without catechol produced similar results as thatobtained with the T. leycettanus P23XBM GH61 polypeptide added to themixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase without catechol. The addition of the T. leycettanusP23XBM GH61 polypeptide to the mixture of T. reesei GH5 endoglucanase IIand A. fumigatus GH3 beta-glucosidase without catechol did not improvehydrolysis of the microcrystalline cellulose. However, as shown in FIGS.1 and 2, the addition of the T. leycettanus P23XBM GH61 polypeptide tothe mixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase with 20 mM catechol resulted in a higher degree ofglucose production (shown in g/liter) compared to the addition of the T.leycettanus P23XBM GH61 polypeptide to the mixture of T. reesei GH5endoglucanase II and A. fumigatus GH3 beta-glucosidase without addedcatechol and compared to the mixture of T. reesei GH5 endoglucanase IIand A. fumigatus GH3 beta-glucosidase without GH61 polypeptide andwithout added catechol. As shown in FIG. 1, the results demonstrated a1.83 improvement (or 83%% increase) in hydrolysis of themicrocrystalline cellulose by the T. leycettanus P23XBM GH61 polypeptideaddition to the mixture of T. reesei GH5 endoglucanase II and A.fumigatus GH3 beta-glucosidase with catechol compared to withoutcatechol at pH 5.0. As shown in FIG. 2, the results demonstrated a 2.25fold improvement (or 125% increase) in hydrolysis of themicrocrystalline cellulose by the T. leycettanus P23XBM GH61 polypeptideaddition to the mixture of T. reesei GH5 endoglucanase II and A.fumigatus GH3 beta-glucosidase with catechol compared to withoutcatechol at pH 8.0.

Example 12: Effect of the Talaromyces leycettanus P23XBP GH61Polypeptide on the Hydrolysis of Microcrystalline Cellulose

The Talaromyces leycettanus P23XBP GH61 polypeptide was evaluated forthe ability to enhance the hydrolysis of microcrystalline cellulose byTrichoderma reesei GH5 endoglucanase II (loaded at 2 mg protein per gcellulose) and Aspergillus fumigatus GH3 beta-glucosidase (loaded at 2mg protein per g cellulose) with and without the addition of 20 mMcatechol at 50° C. The Talaromyces leycettanus P23XBP GH61 polypeptidewas added at 5 mg protein per g cellulose. The mixture of T. reesei GH5endoglucanase II (loaded at 2 mg protein per g cellulose) and A.fumigatus GH3 beta-glucosidase (loaded at 2 mg protein per g cellulose)was also run as a control without added GH61 polypeptide.

The assay was performed as described in Example 10. The 1 ml reactionswith microcrystalline cellulose were conducted for 72 hours in 50 mMammonium acetate pH 5.0 containing 10 μM copper sulfate or 50 mMammonium acetate pH 8.0 containing 10 μM copper sulfate. All reactionswere performed in triplicate and involved single mixing at the beginningof hydrolysis.

As shown in FIGS. 3 and 4, hydrolysis of the microcrystalline celluloseby the mixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase without catechol produced similar results as thatobtained with the T. leycettanus P23XBP GH61 polypeptide added to themixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase without catechol. The addition of the T. leycettanusP23XBP GH61 polypeptide to the mixture of T. reesei GH5 endoglucanase IIand A. fumigatus GH3 beta-glucosidase without catechol did not improvehydrolysis of the microcrystalline cellulose. However, as shown in FIGS.3 and 4, the addition of the T. leycettanus P23XBP GH61 polypeptide tothe mixture of T. reesei GH5 endoglucanase II and A. fumigatus GH3beta-glucosidase with 20 mM catechol resulted in a higher degree ofglucose production (shown in g/liter) compared to the addition of the T.leycettanus P23XBP GH61 polypeptide to the mixture of T. reesei GH5endoglucanase II and A. fumigatus GH3 beta-glucosidase without addedcatechol and compared to the mixture of T. reesei GH5 endoglucanase IIand A. fumigatus GH3 beta-glucosidase without GH61 polypeptide andwithout added catechol. As shown in FIG. 3, the results demonstrated a1.47-fold improvement (or 47% increase) in hydrolysis of themicrocrystalline cellulose by the T. leycettanus P23XBP GH61 polypeptideaddition to the mixture of T. reesei GH5 endoglucanase II and A.fumigatus GH3 beta-glucosidase with catechol compared to withoutcatechol at pH 5.0. As shown in FIG. 4, the results demonstrated a2.52-fold improvement (or 152% increase) in hydrolysis of themicrocrystalline cellulose by the T. leycettanus P23XBP GH61 polypeptideaddition to the mixture of T. reesei GH5 endoglucanase II and A.fumigatus GH3 beta-glucosidase with catechol compared to withoutcatechol at pH 8.0.

Example 13: Pretreated Corn Stover Hydrolysis Assay

Corn stover was pretreated at the U.S. Department of Energy NationalRenewable Energy Laboratory (NREL) using 1.4 wt % sulfuric acid at 165°C. and 107 psi for 8 minutes. The water-insoluble solids in thepretreated corn stover (PCS) contained 56.5% cellulose, 4.6%hemicellulose, and 28.4% lignin. Cellulose and hemicellulose weredetermined by a two-stage sulfuric acid hydrolysis with subsequentanalysis of sugars by high performance liquid chromatography using NRELStandard Analytical Procedure #002. Lignin was determinedgravimetrically after hydrolyzing the cellulose and hemicellulosefractions with sulfuric acid using NREL Standard Analytical Procedure#003.

Unmilled, unwashed PCS (whole slurry PCS) was prepared by adjusting thepH of the PCS to 5.0 by addition of 10 M NaOH with extensive mixing, andthen autoclaving for 20 minutes at 120° C. The dry weight of the wholeslurry PCS was 29%. Milled unwashed PCS (dry weight 32.35%) was preparedby milling whole slurry PCS in a Cosmos ICMG 40 wet multi-utilitygrinder (EssEmm Corporation, Tamil Nadu, India).

The hydrolysis of PCS was conducted using 2.2 ml deep-well plates(Axygen, Union City, Calif., USA) in a total reaction volume of 1.0 ml.The hydrolysis was performed with 50 mg of insoluble PCS solids per mlof 50 mM sodium acetate pH 5.0 buffer containing 1 mM manganese sulfateand various protein loadings of various enzyme compositions (expressedas mg protein per gram of cellulose). Enzyme compositions were preparedand then added simultaneously to all wells in a volume ranging from 50μl to 200 μl, for a final volume of 1 ml in each reaction. The plate wasthen sealed using an ALPS-300™ μlate heat sealer (Abgene, Epsom, UnitedKingdom), mixed thoroughly, and incubated at a specific temperature for72 hours. All experiments reported were performed in triplicate.

Following hydrolysis, samples were filtered using a 0.45 μm MULTISCREEN®96-well filter plate and filtrates analyzed for sugar content asdescribed below. When not used immediately, filtered aliquots werefrozen at −20° C. The sugar concentrations of samples diluted in 0.005 MH₂SO₄ were measured using a 4.6×250 mm AMINEX® HPX-87H column by elutionwith 0.05% w/w benzoic acid-0.005 M H₂SO₄ at 65° C. at a flow rate of0.6 ml per minute, and quantitation by integration of the glucose,cellobiose, and xylose signals from refractive index detection(CHEMSTATION®, AGI LENTO 1100 HPLC, Agilent Technologies, Santa Clara,Calif., USA) calibrated by pure glucose samples. The resultant glucosewas used to calculate the percentage of cellulose conversion for eachreaction.

Measured glucose concentrations were adjusted for the appropriatedilution factor. The net concentrations of enzymatically-producedglucose from milled unwashed PCS were determined by adjusting themeasured glucose concentrations for corresponding background glucoseconcentrations in milled unwashed PCS at zero time. All HPLC dataprocessing was performed using MICROSOFT EXCEL™ software.

The degree of cellulose conversion to glucose was calculated using thefollowing equation: % conversion=(glucose concentration/glucoseconcentration in a limit digest)×100. In order to calculate %conversion, a 100% conversion point was set based on a cellulase control(100 mg of Trichoderma reesei cellulase per gram cellulose), and allvalues were divided by this number and then multiplied by 100.Triplicate data points were averaged and standard deviation wascalculated.

Example 14: Preparation of an Enzyme Composition

The Aspergillus fumigatus GH7A cellobiohydrolase I (SEQ ID NO: 15 [DNAsequence] and SEQ ID NO: 16 [deduced amino acid sequence]) was preparedrecombinantly in Aspergillus oryzae as described in WO 2011/057140. Thefiltered broth of the A. fumigatus cellobiohydrolase I was concentratedand buffer exchanged using a tangential flow concentrator (Pall Filtron,Northborough, Mass., USA) equipped with a 10 kDa polyethersulfonemembrane (Pall Filtron, Northborough, Mass., USA) with 20 mM Tris-HCl pH8.0. The desalted broth of the A. fumigatus cellobiohydrolase I wasloaded onto a Q SEPHAROSE® ion exchange column (GE Healthcare,Piscataway, N.J., USA) equilibrated in 20 mM Tris-HCl pH 8 and elutedusing a linear 0 to 1 M NaCl gradient. Fractions were collected andfractions containing the cellobiohydrolase I were pooled based onSDS-PAGE analysis using 8-16% CRITERION® Stain-free SDS-PAGE gels(Bio-Rad Laboratories, Inc., Hercules, Calif., USA).

The Aspergillus fumigatus GH6A cellobiohydrolase II (SEQ ID NO: 17 [DNAsequence] and SEQ ID NO: 18 [deduced amino acid sequence]) was preparedrecombinantly in Aspergillus oryzae as described in WO 2011/057140. Thefiltered broth of the A. fumigatus cellobiohydrolase II was bufferexchanged into 20 mM Tris pH 8.0 using a 400 ml SEPHADEX™ G-25 column(GE Healthcare, United Kingdom). The fractions were pooled and adjustedto 1.2 M ammonium sulphate-20 mM Tris pH 8.0. The equilibrated proteinwas loaded onto a PHENYL SEPHAROSE™ 6 Fast Flow column (high sub) (GEHealthcare, Piscataway, N.J., USA) equilibrated in 20 mM Tris pH 8.0with 1.2 M ammonium sulphate, and bound proteins were eluted with 20 mMTris pH 8.0 with no ammonium sulphate. The fractions were pooled.

The Trichoderma reesei GH5 endoglucanase II (SEQ ID NO: 11 [DNAsequence] and SEQ ID NO: 12 [deduced amino acid sequence]) was preparedas described in Example 8.

The Aspergillus fumigatus GH10 xylanase (xyn3) (SEQ ID NO: 19 [DNAsequence] and SEQ ID NO: 20 [deduced amino acid sequence]) was preparedrecombinantly according to WO 2006/078256 using Aspergillus oryzae BECh2(WO 2000/39322) as a host. The filtered broth of the A. fumigatusxylanase was desalted and buffer-exchanged into 50 mM sodium acetate pH5.0 using a HIPREP® 26/10 Desalting Column (GE Healthcare, Piscataway,N.J., USA).

The Aspergillus fumigatus Cel3A beta-glucosidase 4M variant (F81D,S264G, N437E, and F493Y using mature polypeptide for numbering) wasrecombinantly prepared according to WO 2012/044915. The filtered brothof Aspergillus fumigatus Cel3A beta-glucosidase 4M variant wasconcentrated and buffer exchanged using a tangential flow concentrator(Pall Filtron, Northborough, Mass., USA) equipped with a 10 kDapolyethersulfone membrane (Pall Filtron, Northborough, Mass., USA) with50 mM sodium acetate pH 5.0 containing 100 mM sodium chloride. Proteinconcentration was determined using a Microplate BCA™ Protein Assay Kitin which bovine serum albumin was used as a protein standard. Inaddition, protein concentration was determined using4-nitrophenyl-beta-d-glucopyranoside (Sigma Chemical Co., Inc., St.Louis, Mo., USA) as a substrate and Aspergillus fumigatus Cel3Abeta-glucosidase 4M variant as a protein standard purified according toWO 2012/044915 with the protein concentration determined using thetheoretic extinction coefficient and the absorbance of the protein at280 nm. The 4-nitrophenyl-beta-D-glucopyranoside (pNPG) was performed asfollows: pNPG was dissolved in DMSO to make a 100 mM stock solution. The100 mM pNPG stock solution was diluted 100× in 50 mM sodium acetate pH 5with 0.01% TWEEN® 20 to 1 mM pNPG containing 50 mM sodium acetate pH 5with 0.01% TWEEN® 20. The protein was diluted to several concentrationsin 50 mM sodium acetate pH 5 with 0.01% TWEEN® 20. Then, 20 μl ofdiluted protein was added to 100 μl of 1 mM pNPG containing 50 mM sodiumacetate pH 5 with 0.01% TWEEN® 20. The reactions were incubated at 40°C. for 20 minutes, and reactions were stopped with 50 μl of 1 M sodiumcarbonate pH 10. The absorbance was measured for pNP production at 405nm.

The Aspergillus fumigatus NN051616 GH3 beta-xylosidase (SEQ ID NO: 21[DNA sequence] and SEQ ID NO: 22 [deduced amino acid sequence]) wasprepared recombinantly in Aspergillus oryzae as described in WO2011/057140. The filtered broth of the A. fumigatus beta-xylosidase wasdesalted and buffer-exchanged into 50 mM sodium acetate pH 5.0 using aHIPREP® 26/10 Desalting Column.

The protein concentration for each of the monocomponents described abovewas determined using a Microplate BCA™ Protein Assay Kit in which bovineserum albumin was used as a protein standard. An enzyme composition wasprepared composed of each monocomponent as follows: 37% Aspergillusfumigatus Cel7A cellobiohydrolase I, 25% Aspergillus fumigatus Cel6Acellobiohydrolase II, 10% Trichoderma reesei GH5 endoglucanase II, 5%Aspergillus fumigatus GH10 xylanase, 5% Aspergillus fumigatusbeta-glucosidase 4M variant, and 3% Aspergillus fumigatusbeta-xylosidase. The enzyme composition is designated herein as“cellulolytic enzyme composition”.

Example 15: Effect of Talaromyces leycettanus P23XBM GH61 Polypeptideand Talaromyces leycettanus P23XBP GH61 Polypeptide on the Hydrolysis ofMilled Unwashed PCS by a Cellulolytic Enzyme Composition

The Talaromyces leycettanus GH61 polypeptide (P23XBM) and Talaromycesleycettanus GH61 polypeptide (P23XBP) were each evaluated for theability to enhance the hydrolysis of milled unwashed PCS (Example 13) bythe cellulolytic enzyme composition disclosed in Example 14 at 2.55 mgtotal protein per g cellulose at 50° C., 55° C., and 60° C. The GH61polypeptides were added at 0.45 mg protein per g cellulose. Thecellulolytic enzyme composition was also run without added GH61polypeptide at 3.0 mg protein per g cellulose.

The assay was performed as described in Example 13. The 1 ml reactionswith milled unwashed PCS (5% insoluble solids) were conducted for 72hours in 50 mM sodium acetate pH 5.0 buffer containing 1 mM manganesesulfate. All reactions were performed in triplicate and involved singlemixing at the beginning of hydrolysis.

As shown in FIG. 5, the cellulolytic enzyme composition that includedthe Talaromyces leycettanus P23XBM GH61 polypeptide outperformed thecellulolytic enzyme composition (2.55 mg protein per g cellulose and 3.0mg protein per g cellulose) without GH61 polypeptide at 50° C., 55° C.,and 60° C., especially at 55° C. as the degree of cellulose conversionto glucose for the GH61 polypeptide added to the cellulolytic enzymecomposition was higher than the cellulolytic enzyme composition withoutadded GH61 at 50° C., 55° C., and 60° C. As shown in FIG. 5, thecellulolytic enzyme composition that included the Talaromycesleycettanus P23XBP GH61 polypeptide outperformed the cellulolytic enzymecomposition (2.55 mg protein per g cellulose and 3.0 mg protein per gcellulose) without GH61 polypeptide at 55° C. as the degree of celluloseconversion to glucose for the GH61 polypeptide added to the cellulolyticenzyme composition was higher than the cellulolytic enzyme compositionwithout added GH61 at 55° C.

The present invention is further described by the following numberedparagraphs:

[1] An isolated polypeptide having cellulolytic enhancing activity,selected from the group consisting of: (a) a polypeptide having at least70% sequence identity to the mature polypeptide of SEQ ID NO: 2 or atleast 80% sequence identity to the mature polypeptide of SEQ ID NO: 4;(b) a polypeptide encoded by a polynucleotide that hybridizes under atleast very high stringency conditions with the mature polypeptide codingsequence of SEQ ID NO: 1 or the cDNA sequence thereof, or the maturepolypeptide coding sequence of SEQ ID NO: 3; or the full-lengthcomplement thereof; (c) a polypeptide encoded by a polynucleotide havingat least 70% sequence identity to the mature polypeptide coding sequenceof SEQ ID NO: 1 or the cDNA sequence thereof, or at least 80% sequenceidentity to the mature polypeptide coding sequence of SEQ ID NO: 3; (d)a variant of the mature polypeptide of SEQ ID NO: 2 or the maturepolypeptide of SEQ ID NO: 4 comprising a substitution, deletion, and/orinsertion at one or more positions; and (e) a fragment of thepolypeptide of (a), (b), (c), or (d) that has cellulolytic enhancingactivity.

[2] The polypeptide of paragraph 1, having at least 70%, at least 75%,at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, atleast 85%, at least 86%, at least 87%, at least 88%, at least 89%, atleast 90%, at least 91%, at least 92%, at least 93%, at least 94%, atleast 95%, at least 96%, at least 97%, at least 98%, at least 99%, or100% sequence identity to the mature polypeptide of SEQ ID NO: 2; or atleast 80%, at least 81%, at least 82%, at least 83%, at least 84%, atleast 85%, at least 86%, at least 87%, at least 88%, at least 89%, atleast 90%, at least 91%, at least 92%, at least 93%, at least 94%, atleast 95%, at least 96%, at least 97%, at least 98%, at least 99%, or100% sequence identity to the mature polypeptide of SEQ ID NO: 4.

[3] The polypeptide of paragraph 1, which is encoded by a polynucleotidethat hybridizes under at least very high stringency conditions with themature polypeptide coding sequence of SEQ ID NO: 1 or the cDNA sequencethereof, or the mature polypeptide coding sequence of SEQ ID NO: 3; orthe full-length complement thereof.

[4] The polypeptide of paragraph 1, which is encoded by a polynucleotidehaving at least 70%, at least 75%, at least 80%, at least 81%, at least82%, at least 83%, at least 84%, at least 85%, at least 86%, at least87%, at least 88%, at least 89%, at least 90%, at least 91%, at least92%, at least 93%, at least 94%, at least 95%, at least 96%, at least97%, at least 98%, at least 99%, or 100% sequence identity to the maturepolypeptide coding sequence of SEQ ID NO: 1 or the cDNA sequencethereof, or at least 80%, at least 81%, at least 82%, at least 83%, atleast 84%, at least 85%, at least 86%, at least 87%, at least 88%, atleast 89%, at least 90%, at least 91%, at least 92%, at least 93%, atleast 94%, at least 95%, at least 96%, at least 97%, at least 98%, atleast 99%, or 100% sequence identity to the mature polypeptide codingsequence of SEQ ID NO: 3.

[5] The polypeptide of any of paragraphs 1-4, comprising or consistingof SEQ ID NO: 2, SEQ ID NO: 4, the mature polypeptide of SEQ ID NO: 2,or the mature polypeptide of SEQ ID NO: 4.

[6] The polypeptide of paragraph 5, wherein the mature polypeptide isamino acids 22 to 251 of SEQ ID NO: 2 or amino acids 23 to 366 of SEQ IDNO: 4.

[7] The polypeptide of paragraph 1, which is a variant of the maturepolypeptide of SEQ ID NO: 2 or the mature polypeptide of SEQ ID NO: 4comprising a substitution, deletion, and/or insertion at one or morepositions.

[8] The polypeptide of any of paragraphs 1-7, which is a fragment of SEQID NO: 2 or SEQ ID NO: 4, wherein the fragment has cellulolyticenhancing activity.

[9] The polypeptide of any of paragraphs 1-8, which is encoded by thepolynucleotide contained in Talaromyces leycettanus CBS 398.68.

[10] An isolated polypeptide comprising a catalytic domain selected fromthe group consisting of: (a) a catalytic domain having at least 80%sequence identity to amino acids 24 to 242 of SEQ ID NO: 4; (b) acatalytic domain encoded by a polynucleotide that hybridizes under atleast very high stringency conditions with nucleotides 70 to 726 of SEQID NO: 3, or the full-length complement thereof; (c) a catalytic domainencoded by a polynucleotide having at least 80% sequence identity tonucleotides 70 to 726 of SEQ ID NO: 3; (d) a variant of amino acids 24to 242 of SEQ ID NO: 4 comprising a substitution, deletion, and/orinsertion at one or more positions; and (e) a fragment of the catalyticdomain of (a), (b), (c), or (d) that has cellulolytic enhancingactivity.

[11] The polypeptide of paragraph 10, further comprising a carbohydratebinding domain.

[12] An isolated polypeptide comprising a carbohydrate binding domainoperably linked to a catalytic domain, wherein the binding domain isselected from the group consisting of: (a) a carbohydrate binding domainhaving at least 80% sequence identity to amino acids 326 to 366 of SEQID NO: 4; (b) a carbohydrate binding domain encoded by a polynucleotidethat hybridizes under at least very high stringency conditions withnucleotides 976 to 1098 of SEQ ID NO: 3 or the full-length complementthereof; (c) a carbohydrate binding domain encoded by a polynucleotidehaving at least 80% sequence identity to nucleotides 976 to 1098 of SEQID NO: 3; (d) a variant of amino acids 326 to 366 of SEQ ID NO: 4comprising a substitution, deletion, and/or insertion at one or morepositions; and (e) a fragment of the carbohydrate binding domain of (a),(b), (c), or (d) that has binding activity.

[13] The polypeptide of paragraph 12, wherein the catalytic domain isobtained from a hydrolase, isomerase, ligase, lyase, oxidoreductase, ortransferase, e.g., an aminopeptidase, amylase, carbohydrase,carboxypeptidase, catalase, cellobiohydrolase, cellulase, chitinase,cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease,endoglucanase, esterase, alpha-galactosidase, beta-galactosidase,glucoamylase, alpha-glucosidase, beta-glucosidase, invertase, laccase,lipase, mannosidase, mutanase, oxidase, pectinolytic enzyme, peroxidase,phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease,transglutaminase, xylanase, or beta-xylosidase.

[14] A composition comprising the polypeptide of any of paragraphs 1-13.

[15] An isolated polynucleotide encoding the polypeptide of any ofparagraphs 1-13.

[16] A nucleic acid construct or expression vector comprising thepolynucleotide of paragraph 15 operably linked to one or more controlsequences that direct the production of the polypeptide in an expressionhost.

[17] A recombinant host cell comprising the polynucleotide of paragraph15 operably linked to one or more control sequences that direct theproduction of the polypeptide.

[18] A method of producing the polypeptide of any of paragraphs 1-13,comprising: cultivating a cell, which in its wild-type form produces thepolypeptide, under conditions conducive for production of thepolypeptide.

[19] The method of paragraph 18, further comprising recovering thepolypeptide.

[20] A method of producing a polypeptide having cellulolytic enhancingactivity, comprising: cultivating the host cell of paragraph 17 underconditions conducive for production of the polypeptide.

[21] The method of paragraph 20, further comprising recovering thepolypeptide.

[22] A transgenic plant, plant part or plant cell transformed with apolynucleotide encoding the polypeptide of any of paragraphs 1-13.

[23] A method of producing a polypeptide having cellulolytic enhancingactivity, comprising: cultivating the transgenic plant or plant cell ofparagraph 22 under conditions conducive for production of thepolypeptide.

[24] The method of paragraph 23, further comprising recovering thepolypeptide.

[25] A method of producing a mutant of a parent cell, comprisinginactivating a polynucleotide encoding the polypeptide of any ofparagraphs 1-13, which results in the mutant producing less of thepolypeptide than the parent cell.

[26] A mutant cell produced by the method of paragraph 25.

[27] The mutant cell of paragraph 26, further comprising a gene encodinga native or heterologous protein.

[28] A method of producing a protein, comprising: cultivating the mutantcell of paragraph 26 or 27 under conditions conducive for production ofthe protein.

[29] The method of paragraph 28, further comprising recovering theprotein.

[30] A double-stranded inhibitory RNA (dsRNA) molecule comprising asubsequence of the polynucleotide of paragraph 15, wherein optionallythe dsRNA is an siRNA or an miRNA molecule.

[31] The double-stranded inhibitory RNA (dsRNA) molecule of paragraph30, which is about 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or moreduplex nucleotides in length.

[32] A method of inhibiting the expression of a polypeptide havingcellulolytic enhancing activity in a cell, comprising administering tothe cell or expressing in the cell the double-stranded inhibitory RNA(dsRNA) molecule of paragraph 30 or 31.

[33] A cell produced by the method of paragraph 32.

[34] The cell of paragraph 33, further comprising a gene encoding anative or heterologous protein.

[35] A method of producing a protein, comprising: cultivating the cellof paragraph 33 or 34 under conditions conducive for production of theprotein.

[36] The method of paragraph 35, further comprising recovering theprotein.

[37] An isolated polynucleotide encoding a signal peptide comprising orconsisting of amino acids 1 to 21 of SEQ ID NO: 2 or amino acids 1 to 23of SEQ ID NO: 4.

[38] A nucleic acid construct or expression vector comprising a geneencoding a protein operably linked to the polynucleotide of paragraph37, wherein the gene is foreign to the polynucleotide encoding thesignal peptide.

[39] A recombinant host cell comprising a gene encoding a proteinoperably linked to the polynucleotide of paragraph 37, wherein the geneis foreign to the polynucleotide encoding the signal peptide.

[40] A method of producing a protein, comprising: cultivating arecombinant host cell comprising a gene encoding a protein operablylinked to the polynucleotide of paragraph 37, wherein the gene isforeign to the polynucleotide encoding the signal peptide, underconditions conducive for production of the protein.

[41] The method of paragraph 40, further comprising recovering theprotein.

[42] A process for degrading a cellulosic material, comprising: treatingthe cellulosic material with an enzyme composition in the presence ofthe polypeptide having cellulolytic enhancing activity of any ofparagraphs 1-13.

[43] The process of paragraph 42, wherein the cellulosic material ispretreated.

[44] The process of paragraph 42 or 43, wherein the enzyme compositioncomprises one or more enzymes selected from the group consisting of acellulase, a hemicellulase, a cellulose inducible protein, an esterase,an expansin, a laccase, a ligninolytic enzyme, a pectinase, a catalase,a peroxidase, a protease, and a swollenin.

[45] The process of paragraph 44, wherein the cellulase is one or moreenzymes selected from the group consisting of an endoglucanase, acellobiohydrolase, and a beta-glucosidase.

[46] The process of paragraph 44, wherein the hemicellulase is one ormore enzymes selected from the group consisting of a xylanase, anacetylxylan esterase, a feruloyl esterase, an arabinofuranosidase, axylosidase, and a glucuronidase.

[47] The process of any of paragraphs 42-46, further comprisingrecovering the degraded cellulosic material.

[48] The process of paragraph 47, wherein the degraded cellulosicmaterial is a sugar.

[49] The process of paragraph 48, wherein the sugar is selected from thegroup consisting of glucose, xylose, mannose, galactose, and arabinose.

[50] A process for producing a fermentation product, comprising: (a)saccharifying a cellulosic material with an enzyme composition in thepresence of the polypeptide having cellulolytic enhancing activity ofany of paragraphs 1-13; (b) fermenting the saccharified cellulosicmaterial with one or more fermenting microorganisms to produce thefermentation product; and (c) recovering the fermentation product fromthe fermentation.

[51] The process of paragraph 50, wherein the cellulosic material ispretreated.

[52] The process of paragraph 50 or 51, wherein the enzyme compositioncomprises the enzyme composition comprises one or more enzymes selectedfrom the group consisting of a cellulase, a hemicellulase, a celluloseinducible protein, an esterase, an expansin, a laccase, a ligninolyticenzyme, a pectinase, a catalase, a peroxidase, a protease, and aswollenin.

[53] The process of paragraph 52, wherein the cellulase is one or moreenzymes selected from the group consisting of an endoglucanase, acellobiohydrolase, and a beta-glucosidase.

[54] The process of paragraph 52, wherein the hemicellulase is one ormore enzymes selected from the group consisting of a xylanase, anacetylxylan esterase, a feruloyl esterase, an arabinofuranosidase, axylosidase, and a glucuronidase.

[55] The process of any of paragraphs 50-54, wherein steps (a) and (b)are performed simultaneously in a simultaneous saccharification andfermentation.

[56] The process of any of paragraphs 50-55, wherein the fermentationproduct is an alcohol, an alkane, a cycloalkane, an alkene, an aminoacid, a gas, isoprene, a ketone, an organic acid, or polyketide.

[57] A process of fermenting a cellulosic material, comprising:fermenting the cellulosic material with one or more fermentingmicroorganisms, wherein the cellulosic material is saccharified with anenzyme composition in the presence of the polypeptide havingcellulolytic enhancing activity of any of paragraphs 1-13.

[58] The process of paragraph 57, wherein the fermenting of thecellulosic material produces a fermentation product.

[59] The process of paragraph 58, further comprising recovering thefermentation product from the fermentation.

[60] The process of paragraph 58 or 59, wherein the fermentation productis an alcohol, an alkane, a cycloalkane, an alkene, an amino acid, agas, isoprene, a ketone, an organic acid, or polyketide.

[61] The process of any of paragraphs 57-60, wherein the cellulosicmaterial is pretreated before saccharification.

[62] The process of any of paragraphs 57-61, wherein the enzymecomposition comprises one or more enzymes selected from the groupconsisting of a cellulase, a hemicellulase, a cellulose inducibleprotein, an esterase, an expansin, a laccase, a ligninolytic enzyme, apectinase, a catalase, a peroxidase, a protease, and a swollenin.

[63] The process of paragraph 62, wherein the cellulase is one or moreenzymes selected from the group consisting of an endoglucanase, acellobiohydrolase, and a beta-glucosidase.

[64] The process of paragraph 62, wherein the hemicellulase is one ormore enzymes selected from the group consisting of a xylanase, anacetylxylan esterase, a feruloyl esterase, an arabinofuranosidase, axylosidase, and a glucuronidase.

[65] A whole broth formulation or cell culture composition comprisingthe polypeptide of any of paragraphs 1-13.

The invention described and claimed herein is not to be limited in scopeby the specific aspects herein disclosed, since these aspects areintended as illustrations of several aspects of the invention. Anyequivalent aspects are intended to be within the scope of thisinvention. Indeed, various modifications of the invention in addition tothose shown and described herein will become apparent to those skilledin the art from the foregoing description. Such modifications are alsointended to fall within the scope of the appended claims. In the case ofconflict, the present disclosure including definitions will control.

1-20. (canceled)
 21. A nucleic acid construct comprising apolynucleotide encoding a GH61 polypeptide having cellulolytic enhancingactivity, wherein the polynucleotide is operably linked to one or moreheterologous control sequences that direct the production of thepolypeptide, and wherein the GH61 polypeptide having cellulolyticenhancing activity is selected from the group consisting of: (a) a GH61polypeptide having at least 90% sequence identity to the maturepolypeptide of SEQ ID NO: 2 or a GH61 polypeptide comprising the maturepolypeptide of SEQ ID NO: 4; (b) a GH61 polypeptide encoded by apolynucleotide that hybridizes under at least very high stringencyconditions with the full-length complement of the mature polypeptidecoding sequence of SEQ ID NO: 1 or the cDNA sequence thereof, whereinvery high stringency conditions are defined as prehybridization andhybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml shearedand denatured salmon sperm DNA, and 50% formamide, and washing threetimes each for 15 minutes using 0.2×SSC, 0.2% SDS at 70° C.; (c) a GH61polypeptide encoded by a polynucleotide having at least 90% sequenceidentity to the mature polypeptide coding sequence of SEQ ID NO: 1 orthe cDNA sequence thereof, or a GH61 polypeptide encoded by apolynucleotide comprising the mature polypeptide coding sequence of SEQID NO: 3 or the cDNA sequence thereof; and (d) a fragment of the GH61polypeptide of the mature polypeptide of SEQ ID NO: 2 that hascellulolytic enhancing activity.
 22. The nucleic acid construct of claim21, wherein the GH61 polypeptide has at least 95% sequence identity tothe mature polypeptide of SEQ ID NO:
 2. 23. The nucleic acid constructof claim 21, wherein the GH61 polypeptide has at least 96% sequenceidentity to the mature polypeptide of SEQ ID NO:
 2. 24. The nucleic acidconstruct of claim 21, wherein the GH61 polypeptide has at least 97%sequence identity to the mature polypeptide of SEQ ID NO:
 2. 25. Thenucleic acid construct of claim 21, wherein the GH61 polypeptide has atleast 98% sequence identity to the mature polypeptide of SEQ ID NO: 2.26. The nucleic acid construct of claim 21, wherein the GH61 polypeptidehas at least 99% sequence identity to the mature polypeptide of SEQ IDNO:
 2. 27. The nucleic acid construct of claim 21, wherein the GH61polypeptide comprises SEQ ID NO: 2 or the mature polypeptide of SEQ IDNO:
 2. 28. The nucleic acid construct of claim 21, wherein the GH61polypeptide comprises SEQ ID NO: 4 or the mature polypeptide of SEQ IDNO:
 4. 29. The nucleic acid construct of claim 21, wherein the GH61polypeptide is encoded by a polynucleotide that hybridizes under atleast very high stringency conditions with the full-length complement ofthe mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof, wherein very high stringency conditions are defined asprehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide,and washing three times each for 15 minutes using 0.2×SSC, 0.2% SDS at70° C.
 30. The nucleic acid construct of claim 21, wherein the GH61polypeptide is encoded by a polynucleotide having at least 95% sequenceidentity to the mature polypeptide coding sequence of SEQ ID NO: 1 orthe cDNA sequence thereof.
 31. The nucleic acid construct of claim 21,wherein the GH61 polypeptide is encoded by a polynucleotide comprisingthe mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof.
 32. The nucleic acid construct of claim 21, whereinthe GH61 polypeptide is encoded by a polynucleotide comprising themature polypeptide coding sequence of SEQ ID NO: 3 or the cDNA sequencethereof.
 33. The nucleic acid construct of claim 21, wherein the GH61polypeptide is a fragment of the mature polypeptide of SEQ ID NO:
 2. 34.A recombinant host cell comprising the nucleic acid construct of claim21.
 35. A method of producing a GH61 polypeptide having cellulolyticenhancing activity, comprising: cultivating the recombinant host cell ofclaim 34 under conditions conducive for production of the polypeptide.36. The method of claim 35, further comprising recovering the GH61polypeptide.
 37. A transgenic plant, plant part or plant celltransformed with the nucleic acid construct of claim
 21. 38. A method ofproducing a GH61 polypeptide having cellulolytic enhancing activity,comprising: cultivating the transgenic plant or plant cell of claim 37under conditions conducive for production of the polypeptide.
 39. Themethod of claim 38, further comprising recovering the GH61 polypeptide.40. An isolated recombinant host cell transformed with a nucleic acidconstruct comprising a polynucleotide encoding a GH61 polypeptide havingcellulolytic enhancing activity, wherein the polynucleotide is operablylinked to one or more control sequences that direct the production ofthe polypeptide, wherein the GH61 polypeptide having cellulolyticenhancing activity is heterologous to the recombinant host cell, andwherein the GH61 polypeptide having cellulolytic enhancing activity isselected from the group consisting of: (a) a GH61 polypeptide having atleast 90% sequence identity to the mature polypeptide of SEQ ID NO: 2 ora GH61 polypeptide comprising the mature polypeptide of SEQ ID NO: 4;(b) a GH61 polypeptide encoded by a polynucleotide that hybridizes underat least very high stringency conditions with the full-length complementof the mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof, wherein very high stringency conditions are defined asprehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide,and washing three times each for 15 minutes using 0.2×SSC, 0.2% SDS at70° C.; (c) a GH61 polypeptide encoded by a polynucleotide having atleast 90% sequence identity to the mature polypeptide coding sequence ofSEQ ID NO: 1 or the cDNA sequence thereof, or a GH61 polypeptide encodedby a polynucleotide comprising the mature polypeptide coding sequence ofSEQ ID NO: 3 or the cDNA sequence thereof; and (d) a fragment of theGH61 polypeptide of the mature polypeptide of SEQ ID NO: 2 that hascellulolytic enhancing activity.
 41. The nucleic acid construct of claim21, wherein the GH61 polypeptide has at least 95% sequence identity tothe mature polypeptide of SEQ ID NO:
 2. 42. The recombinant host cell ofclaim 40, wherein the GH61 polypeptide has at least 96% sequenceidentity to the mature polypeptide of SEQ ID NO:
 2. 43. The recombinanthost cell of claim 40, wherein the GH61 polypeptide has at least 97%sequence identity to the mature polypeptide of SEQ ID NO:
 2. 44. Therecombinant host cell of claim 40, wherein the GH61 polypeptide has atleast 98% sequence identity to the mature polypeptide of SEQ ID NO: 2.45. The recombinant host cell of claim 40, wherein the GH61 polypeptidehas at least 99% sequence identity to the mature polypeptide of SEQ IDNO:
 2. 46. The recombinant host cell of claim 40, wherein the GH61polypeptide comprises SEQ ID NO: 2 or the mature polypeptide of SEQ IDNO:
 2. 47. The recombinant host cell of claim 40, wherein the GH61polypeptide comprises SEQ ID NO: 4 or the mature polypeptide of SEQ IDNO:
 4. 48. The recombinant host cell of claim 40, wherein the GH61polypeptide is encoded by a polynucleotide that hybridizes under atleast very high stringency conditions with the full-length complement ofthe mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof, wherein very high stringency conditions are defined asprehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide,and washing three times each for 15 minutes using 0.2×SSC, 0.2% SDS at70° C.
 49. The recombinant host cell of claim 40, wherein the GH61polypeptide is encoded by a polynucleotide having at least 95% sequenceidentity to the mature polypeptide coding sequence of SEQ ID NO: 1 orthe cDNA sequence thereof.
 50. The recombinant host cell of claim 40,wherein the GH61 polypeptide is encoded by a polynucleotide comprisingthe mature polypeptide coding sequence of SEQ ID NO: 1 or the cDNAsequence thereof.
 51. The recombinant host cell of claim 40, wherein theGH61 polypeptide is encoded by a polynucleotide comprising the maturepolypeptide coding sequence of SEQ ID NO: 3 or the cDNA sequencethereof.
 52. The recombinant host cell of claim 40, wherein the GH61polypeptide is a fragment of the mature polypeptide of SEQ ID NO:
 2. 53.A method for producing a GH61 polypeptide having cellulolytic enhancingactivity, comprising cultivating the recombinant host cell of claim 40under conditions conducive for production of the GH61 polypeptide. 54.The method of claim 53, further comprising recovering the GH61polypeptide.